NOAA SWPC Alerts, Watches and Warnings

The National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) is the official space weather government agency from the United States that provides alerts, watches and warning for space weather disturbances. Below you will find the latest space weather alerts, watches and warnings issued by the NOAA SWPC.

Friday, 20 September 2024

14:28 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3403
Issue Time: 2024 Sep 20 1428 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3402
Begin Time: 2024 Sep 19 1740 UTC
Yesterday Maximum 2MeV Flux: 1228 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Thursday, 19 September 2024

18:12 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3402
Issue Time: 2024 Sep 19 1812 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 19 1740 UTC
Station: GOES-16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

13:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4703
Issue Time: 2024 Sep 19 1332 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4702
Valid From: 2024 Sep 19 1026 UTC
Now Valid Until: 2024 Sep 19 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

13:28 UTC

Space Weather Message Code: ALTK04
Serial Number: 2475
Issue Time: 2024 Sep 19 1328 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 19 1320 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:26 UTC

Space Weather Message Code: WARK04
Serial Number: 4702
Issue Time: 2024 Sep 19 1026 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 19 1026 UTC
Valid To: 2024 Sep 19 1500 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:46 UTC

Space Weather Message Code: ALTK05
Serial Number: 1648
Issue Time: 2024 Sep 19 0246 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 19 0246 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:46 UTC

Space Weather Message Code: WARK05
Serial Number: 1932
Issue Time: 2024 Sep 19 0146 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 19 0150 UTC
Valid To: 2024 Sep 19 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2474
Issue Time: 2024 Sep 19 0001 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 18 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Wednesday, 18 September 2024

23:11 UTC

Space Weather Message Code: WARK04
Serial Number: 4701
Issue Time: 2024 Sep 18 2311 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 18 2315 UTC
Valid To: 2024 Sep 19 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

00:21 UTC

Space Weather Message Code: SUMPX1
Serial Number: 116
Issue Time: 2024 Sep 18 0021 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 17 0735 UTC
Maximum Time: 2024 Sep 17 1050 UTC
End Time: 2024 Sep 17 1615 UTC
Maximum 10MeV Flux: 33 pfu
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Tuesday, 17 September 2024

17:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4700
Issue Time: 2024 Sep 17 1756 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4699
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 18 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

17:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1931
Issue Time: 2024 Sep 17 1756 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1930
Valid From: 2024 Sep 16 2335 UTC
Now Valid Until: 2024 Sep 18 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

15:04 UTC

Space Weather Message Code: ALTK06
Serial Number: 598
Issue Time: 2024 Sep 17 1504 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 17 1459 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1647
Issue Time: 2024 Sep 17 1349 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 1348 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:28 UTC

Space Weather Message Code: WARK04
Serial Number: 4699
Issue Time: 2024 Sep 17 1028 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4698
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 17 2100 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:28 UTC

Space Weather Message Code: WARK05
Serial Number: 1930
Issue Time: 2024 Sep 17 1028 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1929
Valid From: 2024 Sep 16 2335 UTC
Now Valid Until: 2024 Sep 17 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:28 UTC

Space Weather Message Code: WARK06
Serial Number: 545
Issue Time: 2024 Sep 17 1028 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 544
Valid From: 2024 Sep 17 0105 UTC
Now Valid Until: 2024 Sep 17 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:27 UTC

Space Weather Message Code: ALTK06
Serial Number: 597
Issue Time: 2024 Sep 17 1027 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 17 1019 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:12 UTC

Space Weather Message Code: ALTK05
Serial Number: 1646
Issue Time: 2024 Sep 17 1012 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 1003 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1645
Issue Time: 2024 Sep 17 0821 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 0816 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:52 UTC

Space Weather Message Code: ALTPX1
Serial Number: 351
Issue Time: 2024 Sep 17 0752 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 17 0735 UTC
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

05:21 UTC

Space Weather Message Code: WARPX1
Serial Number: 576
Issue Time: 2024 Sep 17 0521 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Sep 17 0521 UTC
Valid To: 2024 Sep 17 2359 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

04:35 UTC

Space Weather Message Code: ALTK07
Serial Number: 167
Issue Time: 2024 Sep 17 0435 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 17 0426 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

03:53 UTC

Space Weather Message Code: ALTK06
Serial Number: 596
Issue Time: 2024 Sep 17 0353 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 17 0346 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

03:31 UTC

Space Weather Message Code: ALTK05
Serial Number: 1644
Issue Time: 2024 Sep 17 0331 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 0331 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:00 UTC

Space Weather Message Code: ALTK08
Serial Number: 42
Issue Time: 2024 Sep 17 0300 UTC

ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2024 Sep 17 0257 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

01:28 UTC

Space Weather Message Code: ALTK07
Serial Number: 166
Issue Time: 2024 Sep 17 0128 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 17 0127 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

01:18 UTC

Space Weather Message Code: WARK07
Serial Number: 116
Issue Time: 2024 Sep 17 0118 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2024 Sep 17 0120 UTC
Valid To: 2024 Sep 17 1200 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

01:14 UTC

Space Weather Message Code: ALTK06
Serial Number: 595
Issue Time: 2024 Sep 17 0114 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 17 0113 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

01:05 UTC

Space Weather Message Code: ALTK05
Serial Number: 1643
Issue Time: 2024 Sep 17 0105 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 17 0103 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:05 UTC

Space Weather Message Code: WARK06
Serial Number: 544
Issue Time: 2024 Sep 17 0105 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Sep 17 0105 UTC
Valid To: 2024 Sep 17 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Monday, 16 September 2024

23:41 UTC

Space Weather Message Code: SUMSUD
Serial Number: 279
Issue Time: 2024 Sep 16 2341 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Sep 16 2329 UTC
Deviation: 39 nT
Station: BOU

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

23:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4698
Issue Time: 2024 Sep 16 2332 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4697
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 17 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

23:32 UTC

Space Weather Message Code: WARK05
Serial Number: 1929
Issue Time: 2024 Sep 16 2332 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 16 2335 UTC
Valid To: 2024 Sep 17 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:02 UTC

Space Weather Message Code: WARSUD
Serial Number: 235
Issue Time: 2024 Sep 16 2302 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Sep 16 2310 UTC
Valid To: 2024 Sep 17 0010 UTC
IP Shock Passage Observed: 2024 Sep 16 2249 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4697
Issue Time: 2024 Sep 16 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4696
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 17 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:28 UTC

Space Weather Message Code: WARK05
Serial Number: 1927
Issue Time: 2024 Sep 16 1028 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 16 1028 UTC
Valid To: 2024 Sep 16 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3401
Issue Time: 2024 Sep 16 1016 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3400
Begin Time: 2024 Sep 15 1215 UTC
Yesterday Maximum 2MeV Flux: 1693 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

08:45 UTC

Space Weather Message Code: WARK04
Serial Number: 4696
Issue Time: 2024 Sep 16 0845 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4695
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 16 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:46 UTC

Space Weather Message Code: WARK04
Serial Number: 4695
Issue Time: 2024 Sep 16 0246 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4694
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 16 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Sunday, 15 September 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4694
Issue Time: 2024 Sep 15 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4693
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 16 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

12:30 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3400
Issue Time: 2024 Sep 15 1230 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 15 1215 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:27 UTC

Space Weather Message Code: WARK04
Serial Number: 4693
Issue Time: 2024 Sep 15 1127 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4692
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 15 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Saturday, 14 September 2024

22:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4692
Issue Time: 2024 Sep 14 2258 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4691
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 15 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

21:04 UTC

Space Weather Message Code: WATA50
Serial Number: 79
Issue Time: 2024 Sep 14 2104 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Sep 15: None (Below G1) Sep 16: G3 (Strong) Sep 17: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

16:30 UTC

Space Weather Message Code: SUM10R
Serial Number: 836
Issue Time: 2024 Sep 14 1630 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 14 1517 UTC
Maximum Time: 2024 Sep 14 1532 UTC
End Time: 2024 Sep 14 1555 UTC
Duration: 38 minutes
Peak Flux: 1000 sfu
Latest Penticton Noon Flux: 186 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

15:53 UTC

Space Weather Message Code: SUMX01
Serial Number: 172
Issue Time: 2024 Sep 14 1553 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Sep 14 1513 UTC
Maximum Time: 2024 Sep 14 1529 UTC
End Time: 2024 Sep 14 1547 UTC
X-ray Class: X4.5
Optical Class: 2b
Location: S18E62
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

15:21 UTC

Space Weather Message Code: ALTXMF
Serial Number: 434
Issue Time: 2024 Sep 14 1521 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 14 1518 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

01:33 UTC

Space Weather Message Code: ALTK04
Serial Number: 2473
Issue Time: 2024 Sep 14 0133 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 14 0130 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Friday, 13 September 2024

22:44 UTC

Space Weather Message Code: ALTK06
Serial Number: 594
Issue Time: 2024 Sep 13 2244 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 13 2244 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:41 UTC

Space Weather Message Code: WARK06
Serial Number: 543
Issue Time: 2024 Sep 13 2241 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Sep 13 2240 UTC
Valid To: 2024 Sep 14 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

22:14 UTC

Space Weather Message Code: ALTK05
Serial Number: 1642
Issue Time: 2024 Sep 13 2214 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 13 2213 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

21:59 UTC

Space Weather Message Code: WARK04
Serial Number: 4691
Issue Time: 2024 Sep 13 2159 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4690
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 14 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

21:58 UTC

Space Weather Message Code: WARK05
Serial Number: 1926
Issue Time: 2024 Sep 13 2158 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 13 2158 UTC
Valid To: 2024 Sep 14 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

17:07 UTC

Space Weather Message Code: WATA20
Serial Number: 1012
Issue Time: 2024 Sep 13 1707 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Sep 14: G1 (Minor) Sep 15: None (Below G1) Sep 16: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

17:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3399
Issue Time: 2024 Sep 13 1701 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 13 1645 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4690
Issue Time: 2024 Sep 13 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4689
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

07:38 UTC

Space Weather Message Code: SUMXM5
Serial Number: 261
Issue Time: 2024 Sep 13 0738 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 13 0638 UTC
Maximum Time: 2024 Sep 13 0656 UTC
End Time: 2024 Sep 13 0734 UTC
X-ray Class: M5.4
Location: S14W90
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

06:56 UTC

Space Weather Message Code: ALTXMF
Serial Number: 433
Issue Time: 2024 Sep 13 0656 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 13 0652 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

05:29 UTC

Space Weather Message Code: WARK05
Serial Number: 1925
Issue Time: 2024 Sep 13 0529 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1924
Valid From: 2024 Sep 12 0419 UTC
Now Valid Until: 2024 Sep 13 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

05:28 UTC

Space Weather Message Code: WARK04
Serial Number: 4689
Issue Time: 2024 Sep 13 0528 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4688
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

05:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1641
Issue Time: 2024 Sep 13 0501 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 13 0456 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:30 UTC

Space Weather Message Code: WARK04
Serial Number: 4688
Issue Time: 2024 Sep 13 0230 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4687
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 0900 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

02:29 UTC

Space Weather Message Code: WARK05
Serial Number: 1924
Issue Time: 2024 Sep 13 0229 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1923
Valid From: 2024 Sep 12 0419 UTC
Now Valid Until: 2024 Sep 13 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

02:08 UTC

Space Weather Message Code: ALTK05
Serial Number: 1640
Issue Time: 2024 Sep 13 0208 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 13 0201 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:41 UTC

Space Weather Message Code: ALTK04
Serial Number: 2472
Issue Time: 2024 Sep 13 0041 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 13 0038 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Thursday, 12 September 2024

23:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1639
Issue Time: 2024 Sep 12 2349 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 2335 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

22:11 UTC

Space Weather Message Code: ALTK04
Serial Number: 2471
Issue Time: 2024 Sep 12 2211 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 12 2208 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

19:53 UTC

Space Weather Message Code: ALTK07
Serial Number: 165
Issue Time: 2024 Sep 12 1953 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 12 1924 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

19:05 UTC

Space Weather Message Code: ALTK06
Serial Number: 593
Issue Time: 2024 Sep 12 1905 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1858 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

18:44 UTC

Space Weather Message Code: ALTK05
Serial Number: 1638
Issue Time: 2024 Sep 12 1844 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1841 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:28 UTC

Space Weather Message Code: ALTK06
Serial Number: 592
Issue Time: 2024 Sep 12 1628 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1623 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

15:48 UTC

Space Weather Message Code: ALTK05
Serial Number: 1637
Issue Time: 2024 Sep 12 1548 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1545 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

15:09 UTC

Space Weather Message Code: SUMXM5
Serial Number: 260
Issue Time: 2024 Sep 12 1509 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 12 1431 UTC
Maximum Time: 2024 Sep 12 1443 UTC
End Time: 2024 Sep 12 1447 UTC
X-ray Class: M6.8
Optical Class: na
Location: S15W87
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

14:46 UTC

Space Weather Message Code: ALTK07
Serial Number: 164
Issue Time: 2024 Sep 12 1446 UTC

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Sep 12 1443 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

14:45 UTC

Space Weather Message Code: ALTXMF
Serial Number: 432
Issue Time: 2024 Sep 12 1445 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 12 1442 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

13:48 UTC

Space Weather Message Code: ALTK06
Serial Number: 591
Issue Time: 2024 Sep 12 1348 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1344 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:33 UTC

Space Weather Message Code: WARK07
Serial Number: 115
Issue Time: 2024 Sep 12 1333 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2024 Sep 12 1332 UTC
Valid To: 2024 Sep 12 2100 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

13:24 UTC

Space Weather Message Code: ALTK05
Serial Number: 1636
Issue Time: 2024 Sep 12 1324 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1318 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:02 UTC

Space Weather Message Code: WARK06
Serial Number: 542
Issue Time: 2024 Sep 12 1302 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 541
Valid From: 2024 Sep 12 0755 UTC
Now Valid Until: 2024 Sep 12 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

13:02 UTC

Space Weather Message Code: WARK05
Serial Number: 1923
Issue Time: 2024 Sep 12 1302 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1922
Valid From: 2024 Sep 12 0419 UTC
Now Valid Until: 2024 Sep 13 0300 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:02 UTC

Space Weather Message Code: WARK04
Serial Number: 4687
Issue Time: 2024 Sep 12 1302 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4686
Valid From: 2024 Sep 12 0355 UTC
Now Valid Until: 2024 Sep 13 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

11:28 UTC

Space Weather Message Code: ALTK06
Serial Number: 590
Issue Time: 2024 Sep 12 1128 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Sep 12 1128 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

10:10 UTC

Space Weather Message Code: ALTK05
Serial Number: 1635
Issue Time: 2024 Sep 12 1010 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 1010 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:05 UTC

Space Weather Message Code: SUMX01
Serial Number: 171
Issue Time: 2024 Sep 12 1005 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Sep 12 0931 UTC
Maximum Time: 2024 Sep 12 0943 UTC
End Time: 2024 Sep 12 0951 UTC
X-ray Class: X1.3
Location: S16E90
NOAA Scale: R3 - Strong

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

09:56 UTC

Space Weather Message Code: SUM10R
Serial Number: 835
Issue Time: 2024 Sep 12 0956 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 12 0939 UTC
Maximum Time: 2024 Sep 12 0940 UTC
End Time: 2024 Sep 12 0941 UTC
Duration: 2 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 207 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

09:45 UTC

Space Weather Message Code: ALTXMF
Serial Number: 431
Issue Time: 2024 Sep 12 0945 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 12 0939 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

07:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1634
Issue Time: 2024 Sep 12 0755 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Sep 12 0754 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:55 UTC

Space Weather Message Code: WARK06
Serial Number: 541
Issue Time: 2024 Sep 12 0755 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Sep 12 0755 UTC
Valid To: 2024 Sep 12 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

05:11 UTC

Space Weather Message Code: SUM10R
Serial Number: 834
Issue Time: 2024 Sep 12 0511 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 12 0431 UTC
Maximum Time: 2024 Sep 12 0431 UTC
End Time: 2024 Sep 12 0431 UTC
Duration: 1 minutes
Peak Flux: 230 sfu
Latest Penticton Noon Flux: 207 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

04:19 UTC

Space Weather Message Code: WARK05
Serial Number: 1922
Issue Time: 2024 Sep 12 0419 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 12 0419 UTC
Valid To: 2024 Sep 12 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

04:01 UTC

Space Weather Message Code: SUMSUD
Serial Number: 278
Issue Time: 2024 Sep 12 0401 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Sep 12 0350 UTC
Deviation: 32 nT
Station: CNB

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

03:57 UTC

Space Weather Message Code: ALTK04
Serial Number: 2470
Issue Time: 2024 Sep 12 0357 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 12 0357 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4686
Issue Time: 2024 Sep 12 0355 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 12 0355 UTC
Valid To: 2024 Sep 12 1800 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:15 UTC

Space Weather Message Code: WARSUD
Serial Number: 234
Issue Time: 2024 Sep 12 0315 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Sep 12 0332 UTC
Valid To: 2024 Sep 12 0412 UTC
IP Shock Passage Observed: 2024 Sep 12 0254 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

00:38 UTC

Space Weather Message Code: SUMXM5
Serial Number: 259
Issue Time: 2024 Sep 12 0038 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 11 2349 UTC
Maximum Time: 2024 Sep 12 0012 UTC
End Time: 2024 Sep 12 0032 UTC
X-ray Class: M5.0
Location: S14W75
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

00:16 UTC

Space Weather Message Code: ALTXMF
Serial Number: 430
Issue Time: 2024 Sep 12 0016 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 12 0011 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Wednesday, 11 September 2024

16:43 UTC

Space Weather Message Code: WARK04
Serial Number: 4685
Issue Time: 2024 Sep 11 1643 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 11 1642 UTC
Valid To: 2024 Sep 11 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Tuesday, 10 September 2024

17:37 UTC

Space Weather Message Code: WATA30
Serial Number: 243
Issue Time: 2024 Sep 10 1737 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 11: G1 (Minor) Sep 12: G1 (Minor) Sep 13: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

11:54 UTC

Space Weather Message Code: SUMPX1
Serial Number: 115
Issue Time: 2024 Sep 10 1154 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 09 1640 UTC
Maximum Time: 2024 Sep 09 2250 UTC
End Time: 2024 Sep 10 0555 UTC
Maximum 10MeV Flux: 34 pfu
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

00:41 UTC

Space Weather Message Code: ALTTP4
Serial Number: 663
Issue Time: 2024 Sep 10 0041 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Sep 09 2353 UTC



Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

00:03 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1356
Issue Time: 2024 Sep 10 0003 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 09 2345 UTC
Estimated Velocity: 408 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Monday, 9 September 2024

19:43 UTC

Space Weather Message Code: WARPX1
Serial Number: 575
Issue Time: 2024 Sep 09 1943 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 574
Valid From: 2024 Sep 09 0750 UTC
Now Valid Until: 2024 Sep 10 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

17:22 UTC

Space Weather Message Code: ALTPX1
Serial Number: 350
Issue Time: 2024 Sep 09 1722 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Sep 09 1640 UTC
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

07:49 UTC

Space Weather Message Code: WARPX1
Serial Number: 574
Issue Time: 2024 Sep 09 0749 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Sep 09 0750 UTC
Valid To: 2024 Sep 09 2000 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

05:54 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1355
Issue Time: 2024 Sep 09 0554 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 09 0510 UTC
Estimated Velocity: 668 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Sunday, 8 September 2024

07:53 UTC

Space Weather Message Code: WATA30
Serial Number: 242
Issue Time: 2024 Sep 08 0753 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 09: None (Below G1) Sep 10: G2 (Moderate) Sep 11: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

01:29 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1354
Issue Time: 2024 Sep 08 0129 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 08 0057 UTC
Estimated Velocity: 924 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Wednesday, 4 September 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4684
Issue Time: 2024 Sep 04 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4683
Valid From: 2024 Sep 04 1055 UTC
Now Valid Until: 2024 Sep 04 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

15:18 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3398
Issue Time: 2024 Sep 04 1518 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Sep 04 1455 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

11:00 UTC

Space Weather Message Code: SUMSUD
Serial Number: 277
Issue Time: 2024 Sep 04 1100 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Sep 04 1030 UTC
Deviation: 40 nT
Station: BOU

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

10:43 UTC

Space Weather Message Code: WARK05
Serial Number: 1921
Issue Time: 2024 Sep 04 1043 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Sep 04 1043 UTC
Valid To: 2024 Sep 04 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

10:43 UTC

Space Weather Message Code: ALTK04
Serial Number: 2469
Issue Time: 2024 Sep 04 1043 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Sep 04 1039 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:39 UTC

Space Weather Message Code: WARK04
Serial Number: 4683
Issue Time: 2024 Sep 04 1039 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Sep 04 1055 UTC
Valid To: 2024 Sep 04 1800 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

10:17 UTC

Space Weather Message Code: WARSUD
Serial Number: 233
Issue Time: 2024 Sep 04 1017 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Sep 04 1030 UTC
Valid To: 2024 Sep 04 1100 UTC
IP Shock Passage Observed: 2024 Sep 04 0940 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

03:04 UTC

Space Weather Message Code: SUM10R
Serial Number: 833
Issue Time: 2024 Sep 04 0304 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Sep 04 0250 UTC
Maximum Time: 2024 Sep 04 0251 UTC
End Time: 2024 Sep 04 0251 UTC
Duration: 1 minutes
Peak Flux: 250 sfu
Latest Penticton Noon Flux: 242 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

Tuesday, 3 September 2024

12:55 UTC

Space Weather Message Code: WARPX1
Serial Number: 573
Issue Time: 2024 Sep 03 1255 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Sep 03 1255 UTC
Valid To: 2024 Sep 04 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

08:42 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1353
Issue Time: 2024 Sep 03 0842 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Sep 03 0753 UTC
Estimated Velocity: 547 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Sunday, 1 September 2024

17:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4682
Issue Time: 2024 Sep 01 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4681
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Sep 02 0600 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

14:41 UTC

Space Weather Message Code: SUMXM5
Serial Number: 258
Issue Time: 2024 Sep 01 1441 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Sep 01 1141 UTC
Maximum Time: 2024 Sep 01 1322 UTC
End Time: 2024 Sep 01 1436 UTC
X-ray Class: M5.5
Location: S21E90
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

13:03 UTC

Space Weather Message Code: ALTXMF
Serial Number: 429
Issue Time: 2024 Sep 01 1303 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Sep 01 1300 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

11:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4681
Issue Time: 2024 Sep 01 1158 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4680
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Sep 01 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Saturday, 31 August 2024

23:21 UTC

Space Weather Message Code: WARK04
Serial Number: 4680
Issue Time: 2024 Aug 31 2321 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4679
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Sep 01 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4679
Issue Time: 2024 Aug 31 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4678
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

17:16 UTC

Space Weather Message Code: ALTK05
Serial Number: 1633
Issue Time: 2024 Aug 31 1716 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 31 1715 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

16:15 UTC

Space Weather Message Code: WARK05
Serial Number: 1920
Issue Time: 2024 Aug 31 1615 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Aug 31 1612 UTC
Valid To: 2024 Aug 31 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:44 UTC

Space Weather Message Code: WARK04
Serial Number: 4678
Issue Time: 2024 Aug 31 1444 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4677
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 2100 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

09:14 UTC

Space Weather Message Code: ALTK05
Serial Number: 1632
Issue Time: 2024 Aug 31 0914 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 31 0900 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

08:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4677
Issue Time: 2024 Aug 31 0856 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4676
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1919
Issue Time: 2024 Aug 31 0856 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1918
Valid From: 2024 Aug 30 2335 UTC
Now Valid Until: 2024 Aug 31 1500 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Friday, 30 August 2024

23:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1631
Issue Time: 2024 Aug 30 2359 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 30 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:34 UTC

Space Weather Message Code: WARK05
Serial Number: 1918
Issue Time: 2024 Aug 30 2334 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Aug 30 2335 UTC
Valid To: 2024 Aug 31 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

23:34 UTC

Space Weather Message Code: WARK04
Serial Number: 4676
Issue Time: 2024 Aug 30 2334 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4675
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 31 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

13:21 UTC

Space Weather Message Code: WARK04
Serial Number: 4675
Issue Time: 2024 Aug 30 1321 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4674
Valid From: 2024 Aug 30 0849 UTC
Now Valid Until: 2024 Aug 30 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 2468
Issue Time: 2024 Aug 30 0852 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Aug 30 0852 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

08:49 UTC

Space Weather Message Code: WARK04
Serial Number: 4674
Issue Time: 2024 Aug 30 0849 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 30 0849 UTC
Valid To: 2024 Aug 30 1500 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Wednesday, 28 August 2024

21:13 UTC

Space Weather Message Code: WATA20
Serial Number: 1011
Issue Time: 2024 Aug 28 2113 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 29: G1 (Minor) Aug 30: None (Below G1) Aug 31: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Lingering CME effects are likely to cause geomagnetic storming during the early hours of 29 Aug.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:32 UTC

Space Weather Message Code: WARK05
Serial Number: 1917
Issue Time: 2024 Aug 28 0732 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1916
Valid From: 2024 Aug 28 0133 UTC
Now Valid Until: 2024 Aug 28 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

07:28 UTC

Space Weather Message Code: WARK04
Serial Number: 4673
Issue Time: 2024 Aug 28 0728 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4672
Valid From: 2024 Aug 27 2323 UTC
Now Valid Until: 2024 Aug 28 2359 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

07:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1630
Issue Time: 2024 Aug 28 0703 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 28 0659 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

03:01 UTC

Space Weather Message Code: ALTK06
Serial Number: 589
Issue Time: 2024 Aug 28 0301 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Aug 28 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

02:23 UTC

Space Weather Message Code: WARK06
Serial Number: 540
Issue Time: 2024 Aug 28 0223 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Aug 28 0223 UTC
Valid To: 2024 Aug 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

02:12 UTC

Space Weather Message Code: ALTK05
Serial Number: 1629
Issue Time: 2024 Aug 28 0212 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Aug 28 0212 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

01:33 UTC

Space Weather Message Code: WARK05
Serial Number: 1916
Issue Time: 2024 Aug 28 0133 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Aug 28 0133 UTC
Valid To: 2024 Aug 28 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

00:04 UTC

Space Weather Message Code: ALTK04
Serial Number: 2467
Issue Time: 2024 Aug 28 0004 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Aug 27 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Tuesday, 27 August 2024

23:23 UTC

Space Weather Message Code: WARK04
Serial Number: 4672
Issue Time: 2024 Aug 27 2323 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 27 2323 UTC
Valid To: 2024 Aug 28 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Sunday, 25 August 2024

00:19 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1352
Issue Time: 2024 Aug 25 0019 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Aug 25 0000 UTC
Estimated Velocity: 360 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Friday, 23 August 2024

20:27 UTC

Space Weather Message Code: SUMXM5
Serial Number: 257
Issue Time: 2024 Aug 23 2027 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Aug 23 2008 UTC
Maximum Time: 2024 Aug 23 2012 UTC
End Time: 2024 Aug 23 2018 UTC
X-ray Class: M5.1
Location: S27E22
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

20:20 UTC

Space Weather Message Code: ALTXMF
Serial Number: 428
Issue Time: 2024 Aug 23 2020 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Aug 23 2012 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

06:19 UTC

Space Weather Message Code: WARK04
Serial Number: 4671
Issue Time: 2024 Aug 23 0619 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 23 0619 UTC
Valid To: 2024 Aug 23 1200 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

03:54 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1351
Issue Time: 2024 Aug 23 0354 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Aug 23 0343 UTC
Estimated Velocity: 347 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

02:20 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1350
Issue Time: 2024 Aug 23 0220 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Aug 23 0119 UTC
Estimated Velocity: 236 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Thursday, 22 August 2024

02:46 UTC

Space Weather Message Code: WARK04
Serial Number: 4670
Issue Time: 2024 Aug 22 0246 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Aug 22 0246 UTC
Valid To: 2024 Aug 22 0900 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.