Alertas NOAA SWPC, Relógios e Avisos

O Centro de Previsão do Clima Espacial da Administração Nacional Oceânica e Atmosférica (SWPC NOAA) é a agência oficial do clima espacial dos Estados Unidos que fornece alertas, observações e avisos sobre distúrbios do clima espacial. Abaixo, você encontrará os alertas, observações e avisos do clima espacial mais recentes emitidos pelo SWPC do NOAA.

quinta-feira, 14 agosto 2025

12:11 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3514
Issue Time: 2025 Aug 14 1211 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3513
Begin Time: 2025 Aug 10 1145 UTC
Yesterday Maximum 2MeV Flux: 8356 pfu

Comment: The great than 2 MeV electron flux in geosynchronous orbit continues to reach high levels of greater than or equal to 1,000 pfu.



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

11:51 UTC

Space Weather Message Code: WARK04
Serial Number: 5063
Issue Time: 2025 Aug 14 1151 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5062
Valid From: 2025 Aug 13 2149 UTC
Now Valid Until: 2025 Aug 14 1500 UTC
Warning Condition: Persistence

Comment: High, lattitude areas under nightfall are expcted to continue to experience active geomagnetic conditions until 1500 UTC.

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.

02:31 UTC

Space Weather Message Code: WARK04
Serial Number: 5062
Issue Time: 2025 Aug 14 0231 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5061
Valid From: 2025 Aug 13 2149 UTC
Now Valid Until: 2025 Aug 14 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.

quarta-feira, 13 agosto 2025

21:49 UTC

Space Weather Message Code: WARK04
Serial Number: 5061
Issue Time: 2025 Aug 13 2149 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Aug 13 2149 UTC
Valid To: 2025 Aug 14 0300 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.

05:17 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3513
Issue Time: 2025 Aug 13 0517 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3512
Begin Time: 2025 Aug 10 1145 UTC
Yesterday Maximum 2MeV Flux: 3163 pfu



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

terça-feira, 12 agosto 2025

23:54 UTC

Space Weather Message Code: WARK04
Serial Number: 5060
Issue Time: 2025 Aug 12 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5059
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 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.

14:06 UTC

Space Weather Message Code: WARK04
Serial Number: 5059
Issue Time: 2025 Aug 12 1406 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5058
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 13 0000 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.

11:13 UTC

Space Weather Message Code: WARK04
Serial Number: 5058
Issue Time: 2025 Aug 12 1113 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5057
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 12 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.

08:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3512
Issue Time: 2025 Aug 12 0803 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3511
Begin Time: 2025 Aug 10 1145 UTC
Yesterday Maximum 2MeV Flux: 6326 pfu



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

01:44 UTC

Space Weather Message Code: WARK04
Serial Number: 5057
Issue Time: 2025 Aug 12 0144 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5056
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 12 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.

segunda-feira, 11 agosto 2025

11:11 UTC

Space Weather Message Code: WARK04
Serial Number: 5056
Issue Time: 2025 Aug 11 1111 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5055
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 12 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.

05:39 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3511
Issue Time: 2025 Aug 11 0539 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3510
Begin Time: 2025 Aug 10 1145 UTC
Yesterday Maximum 2MeV Flux: 3695 pfu



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

domingo, 10 agosto 2025

15:03 UTC

Space Weather Message Code: WARK04
Serial Number: 5055
Issue Time: 2025 Aug 10 1503 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5054
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 11 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.

12:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3510
Issue Time: 2025 Aug 10 1206 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Aug 10 1145 UTC
Station: GOES19




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

07:48 UTC

Space Weather Message Code: WARK05
Serial Number: 2087
Issue Time: 2025 Aug 10 0748 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Aug 10 0747 UTC
Valid To: 2025 Aug 10 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.

02:19 UTC

Space Weather Message Code: WARK04
Serial Number: 5054
Issue Time: 2025 Aug 10 0219 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5053
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 10 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.

sábado, 9 agosto 2025

16:52 UTC

Space Weather Message Code: ALTK06
Serial Number: 651
Issue Time: 2025 Aug 09 1652 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Aug 09 1648 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.

16:28 UTC

Space Weather Message Code: WARK06
Serial Number: 599
Issue Time: 2025 Aug 09 1628 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Aug 09 1628 UTC
Valid To: 2025 Aug 09 2359 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.

16:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1840
Issue Time: 2025 Aug 09 1601 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 09 1556 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.

13:30 UTC

Space Weather Message Code: ALTK05
Serial Number: 1839
Issue Time: 2025 Aug 09 1330 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 09 1327 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.

10:54 UTC

Space Weather Message Code: ALTK05
Serial Number: 1838
Issue Time: 2025 Aug 09 1054 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 09 1050 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.

08:40 UTC

Space Weather Message Code: WARK05
Serial Number: 2086
Issue Time: 2025 Aug 09 0840 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2085
Valid From: 2025 Aug 08 1430 UTC
Now Valid Until: 2025 Aug 09 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 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.

08:40 UTC

Space Weather Message Code: WARK04
Serial Number: 5053
Issue Time: 2025 Aug 09 0840 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5052
Valid From: 2025 Aug 08 1415 UTC
Now Valid Until: 2025 Aug 10 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.

08:21 UTC

Space Weather Message Code: ALTK05
Serial Number: 1837
Issue Time: 2025 Aug 09 0821 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 09 0824 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.

04:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1836
Issue Time: 2025 Aug 09 0459 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 09 0455 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: ALTK05
Serial Number: 1835
Issue Time: 2025 Aug 09 0230 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 09 0231 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.

sexta-feira, 8 agosto 2025

20:06 UTC

Space Weather Message Code: ALTK05
Serial Number: 1834
Issue Time: 2025 Aug 08 2006 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 08 2005 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.

15:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1833
Issue Time: 2025 Aug 08 1500 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Aug 08 1459 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.

14:29 UTC

Space Weather Message Code: WARK05
Serial Number: 2085
Issue Time: 2025 Aug 08 1429 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Aug 08 1430 UTC
Valid To: 2025 Aug 09 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.

14:22 UTC

Space Weather Message Code: ALTK04
Serial Number: 2584
Issue Time: 2025 Aug 08 1422 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Aug 08 1420 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.

14:15 UTC

Space Weather Message Code: WARK04
Serial Number: 5052
Issue Time: 2025 Aug 08 1415 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Aug 08 1415 UTC
Valid To: 2025 Aug 09 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.

quinta-feira, 7 agosto 2025

11:58 UTC

Space Weather Message Code: ALTTP4
Serial Number: 685
Issue Time: 2025 Aug 07 1158 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Aug 07 1136 UTC

Comment: Likely associated with the M3.9 flare event from AR 4168.



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.

quarta-feira, 6 agosto 2025

18:47 UTC

Space Weather Message Code: WATA30
Serial Number: 255
Issue Time: 2025 Aug 06 1847 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Aug 07: None (Below G1) Aug 08: G2 (Moderate) Aug 09: 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.

18:46 UTC

Space Weather Message Code: WATA50
Serial Number: 88
Issue Time: 2025 Aug 06 1846 UTC

CANCEL WATCH: Geomagnetic Storm Category G3 Predicted
Cancel Serial Number: 87
Original Issue Time: 2025 Aug 06 1844 UTC

Comment: Error in product

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.

18:44 UTC

Space Weather Message Code: WATA50
Serial Number: 87
Issue Time: 2025 Aug 06 1844 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Aug 07: None (Below G1) Aug 08: G2 (Moderate) Aug 09: 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 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.

terça-feira, 5 agosto 2025

20:40 UTC

Space Weather Message Code: SUM10R
Serial Number: 877
Issue Time: 2025 Aug 05 2040 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Aug 05 1550 UTC
Maximum Time: 2025 Aug 05 1551 UTC
End Time: 2025 Aug 05 1553 UTC
Duration: 3 minutes
Peak Flux: 200 sfu
Latest Penticton Noon Flux: 145 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.

16:36 UTC

Space Weather Message Code: ALTTP4
Serial Number: 684
Issue Time: 2025 Aug 05 1636 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Aug 05 1558 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.

16:36 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1423
Issue Time: 2025 Aug 05 1636 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Aug 05 1558 UTC
Estimated Velocity: 865 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.

domingo, 3 agosto 2025

19:55 UTC

Space Weather Message Code: ALTK04
Serial Number: 2583
Issue Time: 2025 Aug 03 1955 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Aug 03 1955 UTC
Synoptic Period: 1800-2100 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.

19:47 UTC

Space Weather Message Code: WARK04
Serial Number: 5051
Issue Time: 2025 Aug 03 1947 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Aug 03 1945 UTC
Valid To: 2025 Aug 04 0600 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.

sexta-feira, 1 agosto 2025

20:52 UTC

Space Weather Message Code: WARK04
Serial Number: 5050
Issue Time: 2025 Aug 01 2052 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5049
Valid From: 2025 Aug 01 1345 UTC
Now Valid Until: 2025 Aug 02 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.

13:44 UTC

Space Weather Message Code: WARK04
Serial Number: 5049
Issue Time: 2025 Aug 01 1344 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Aug 01 1345 UTC
Valid To: 2025 Aug 01 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.

13:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3509
Issue Time: 2025 Aug 01 1331 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3508
Begin Time: 2025 Jul 31 1635 UTC
Yesterday Maximum 2MeV Flux: 1104 pfu



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

quinta-feira, 31 julho 2025

16:52 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3508
Issue Time: 2025 Jul 31 1652 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jul 31 1635 UTC
Station: GOES19




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

segunda-feira, 28 julho 2025

08:46 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3507
Issue Time: 2025 Jul 28 0846 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3506
Begin Time: 2025 Jul 24 1320 UTC
Yesterday Maximum 2MeV Flux: 1686 pfu



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

domingo, 27 julho 2025

12:52 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3506
Issue Time: 2025 Jul 27 1252 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3505
Begin Time: 2025 Jul 24 1320 UTC
Yesterday Maximum 2MeV Flux: 2510 pfu



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

sábado, 26 julho 2025

17:53 UTC

Space Weather Message Code: ALTK04
Serial Number: 2582
Issue Time: 2025 Jul 26 1753 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 26 1750 UTC
Synoptic Period: 1500-1800 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.

17:30 UTC

Space Weather Message Code: WARK04
Serial Number: 5048
Issue Time: 2025 Jul 26 1730 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 26 1730 UTC
Valid To: 2025 Jul 27 0300 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.

06:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3505
Issue Time: 2025 Jul 26 0601 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3504
Begin Time: 2025 Jul 24 1320 UTC
Yesterday Maximum 2MeV Flux: 3124 pfu



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

sexta-feira, 25 julho 2025

10:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3504
Issue Time: 2025 Jul 25 1005 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3503
Begin Time: 2025 Jul 24 1320 UTC
Yesterday Maximum 2MeV Flux: 2312 pfu



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

quinta-feira, 24 julho 2025

19:47 UTC

Space Weather Message Code: WATA20
Serial Number: 1054
Issue Time: 2025 Jul 24 1947 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 25: None (Below G1) Jul 26: None (Below G1) Jul 27: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: G1 (Minor) geomagnetic storming is likely on 27 July due to CME effects from an event that left the Sun on 23 July.

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.

17:47 UTC

Space Weather Message Code: WARK04
Serial Number: 5047
Issue Time: 2025 Jul 24 1747 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5046
Valid From: 2025 Jul 24 1038 UTC
Now Valid Until: 2025 Jul 25 0300 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.

13:34 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3503
Issue Time: 2025 Jul 24 1334 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Jul 24 1320 UTC
Station: GOES19




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

11:51 UTC

Space Weather Message Code: ALTK04
Serial Number: 2581
Issue Time: 2025 Jul 24 1151 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 24 1144 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.

10:38 UTC

Space Weather Message Code: WARK04
Serial Number: 5046
Issue Time: 2025 Jul 24 1038 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 24 1038 UTC
Valid To: 2025 Jul 24 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.

quarta-feira, 23 julho 2025

19:05 UTC

Space Weather Message Code: WATA20
Serial Number: 1053
Issue Time: 2025 Jul 23 1905 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 24: G1 (Minor) Jul 25: None (Below G1) Jul 26: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Isolated periods of G1 (Minor) geomagnetic storming are likely primarily early on 24 July under sustained CH HSS effects.

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.

18:05 UTC

Space Weather Message Code: WARK04
Serial Number: 5045
Issue Time: 2025 Jul 23 1805 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5044
Valid From: 2025 Jul 23 1137 UTC
Now Valid Until: 2025 Jul 24 0900 UTC
Warning Condition: Persistence

Comment: Active conditions are expected to continue through the early periods of 24 Jul under negative polarity CH HSS effects.

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.

15:04 UTC

Space Weather Message Code: ALTK05
Serial Number: 1832
Issue Time: 2025 Jul 23 1504 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 23 1459 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Comment: Minor geomagnetic storming levels were reached due to continued negative polarity CH HSS effects.

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.

11:38 UTC

Space Weather Message Code: WARK04
Serial Number: 5044
Issue Time: 2025 Jul 23 1138 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 23 1137 UTC
Valid To: 2025 Jul 23 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.

11:36 UTC

Space Weather Message Code: WARK05
Serial Number: 2084
Issue Time: 2025 Jul 23 1136 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2083
Valid From: 2025 Jul 22 2051 UTC
Now Valid Until: 2025 Jul 23 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.

05:41 UTC

Space Weather Message Code: WARK05
Serial Number: 2083
Issue Time: 2025 Jul 23 0541 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2082
Valid From: 2025 Jul 22 2051 UTC
Now Valid Until: 2025 Jul 23 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.

terça-feira, 22 julho 2025

22:52 UTC

Space Weather Message Code: WARK06
Serial Number: 598
Issue Time: 2025 Jul 22 2252 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Jul 22 2252 UTC
Valid To: 2025 Jul 23 0600 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.

22:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1831
Issue Time: 2025 Jul 22 2249 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 22 2249 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.

21:05 UTC

Space Weather Message Code: ALTK05
Serial Number: 1830
Issue Time: 2025 Jul 22 2105 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 22 2059 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.

20:51 UTC

Space Weather Message Code: WARK05
Serial Number: 2082
Issue Time: 2025 Jul 22 2051 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 22 2051 UTC
Valid To: 2025 Jul 23 0600 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.

20:50 UTC

Space Weather Message Code: ALTK04
Serial Number: 2580
Issue Time: 2025 Jul 22 2050 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 22 2046 UTC
Synoptic Period: 1800-2100 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.

19:24 UTC

Space Weather Message Code: WARK04
Serial Number: 5043
Issue Time: 2025 Jul 22 1924 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 22 1922 UTC
Valid To: 2025 Jul 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.

05:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3502
Issue Time: 2025 Jul 22 0507 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3501
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 13015 pfu



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

segunda-feira, 21 julho 2025

19:44 UTC

Space Weather Message Code: WATA20
Serial Number: 1052
Issue Time: 2025 Jul 21 1944 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jul 22: None (Below G1) Jul 23: G1 (Minor) Jul 24: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: G1 (Minor) geomagnetic storming is likely on 23 Jul due to recurrent, negative polarity coronal hole high speed stream effects.

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.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3501
Issue Time: 2025 Jul 21 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3500
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 14495 pfu



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

domingo, 20 julho 2025

06:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3500
Issue Time: 2025 Jul 20 0605 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3499
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 11583 pfu



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

sábado, 19 julho 2025

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3499
Issue Time: 2025 Jul 19 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3498
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 10273 pfu



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

sexta-feira, 18 julho 2025

14:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5042
Issue Time: 2025 Jul 18 1437 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5041
Valid From: 2025 Jul 17 0840 UTC
Now Valid Until: 2025 Jul 18 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.

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3498
Issue Time: 2025 Jul 18 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3497
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 6590 pfu



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

quinta-feira, 17 julho 2025

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5041
Issue Time: 2025 Jul 17 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5040
Valid From: 2025 Jul 17 0840 UTC
Now Valid Until: 2025 Jul 18 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.

08:52 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3497
Issue Time: 2025 Jul 17 0852 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3496
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 4840 pfu



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

08:51 UTC

Space Weather Message Code: ALTK04
Serial Number: 2579
Issue Time: 2025 Jul 17 0851 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 17 0851 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.

08:41 UTC

Space Weather Message Code: WARK04
Serial Number: 5040
Issue Time: 2025 Jul 17 0841 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 17 0840 UTC
Valid To: 2025 Jul 17 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.

quarta-feira, 16 julho 2025

23:34 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3496
Issue Time: 2025 Jul 16 2334 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3495
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 1010 pfu



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

23:07 UTC

Space Weather Message Code: ALTK05
Serial Number: 1829
Issue Time: 2025 Jul 16 2307 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Jul 16 2301 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.

22:54 UTC

Space Weather Message Code: WARK05
Serial Number: 2081
Issue Time: 2025 Jul 16 2254 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Jul 16 2254 UTC
Valid To: 2025 Jul 17 0600 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.

22:43 UTC

Space Weather Message Code: ALTK04
Serial Number: 2578
Issue Time: 2025 Jul 16 2243 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 16 2205 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.

21:41 UTC

Space Weather Message Code: WARK04
Serial Number: 5039
Issue Time: 2025 Jul 16 2141 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 16 2140 UTC
Valid To: 2025 Jul 17 0600 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.

11:47 UTC

Space Weather Message Code: WARK04
Serial Number: 5038
Issue Time: 2025 Jul 16 1147 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5037
Valid From: 2025 Jul 16 0240 UTC
Now Valid Until: 2025 Jul 16 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.

11:46 UTC

Space Weather Message Code: ALTK04
Serial Number: 2577
Issue Time: 2025 Jul 16 1146 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Jul 16 1146 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.

05:17 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3495
Issue Time: 2025 Jul 16 0517 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3494
Begin Time: 2025 Jul 14 1550 UTC
Yesterday Maximum 2MeV Flux: 1910 pfu



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

02:41 UTC

Space Weather Message Code: WARK04
Serial Number: 5037
Issue Time: 2025 Jul 16 0241 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Jul 16 0240 UTC
Valid To: 2025 Jul 16 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.