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Space Weather Message Code: WARK04
Serial Number: 5387
Issue Time: 2026 Jul 15 0853 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5386
Valid From: 2026 Jul 15 0143 UTC
Now Valid Until: 2026 Jul 15 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.
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Space Weather Message Code: ALTK04
Serial Number: 2675
Issue Time: 2026 Jul 15 0558 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jul 15 0554 UTC
Synoptic Period: 0300-0600
Active Warning: YES
Comment:
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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5386
Issue Time: 2026 Jul 15 0554 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5385
Valid From: 2026 Jul 15 0143 UTC
Now Valid Until: 2026 Jul 15 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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5385
Issue Time: 2026 Jul 15 0144 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jul 15 0143 UTC
Valid To: 2026 Jul 15 0600 UTC
Warning Conditions: Onset
Comment:
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.
______________________________________________________
Space Weather Message Code: ALTK04
Serial Number: 2674
Issue Time: 2026 Jul 14 0008 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jul 13 2359 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Comment:
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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5384
Issue Time: 2026 Jul 13 2350 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jul 13 2349 UTC
Valid To: 2026 Jul 14 0900 UTC
Warning Conditions: Onset
Comment:
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.
______________________________________________________
Space Weather Message Code: ALTEF3
Serial Number: 3716
Issue Time: 2026 Jul 13 1027 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3715
Begin Time: 2026 Jul 10 1126 UTC
Yesterday Maximum 2MeV Flux: 3729 pfu
Yesterday's max: 3,730 pfu
Yesterday's max: 3,730 pfu
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Space Weather Message Code: WARK05
Serial Number: 2250
Issue Time: 2026 Jul 12 2101 UTC
CANCEL WARNING: Geomagnetic K-index of 5 expected
Cancel Serial Number: 2249
Original Issue Time: 2026 Jul 12 1411 UTC
Should have only been valid until 12/2100 UTC.
Should have only been valid until 12/2100 UTC.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.
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Space Weather Message Code: ALTK05
Serial Number: 2039
Issue Time: 2026 Jul 12 1503 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Jul 12 1459 UTC
Synoptic Period: 1200-1500
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:
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.
______________________________________________________
Space Weather Message Code: WARK05
Serial Number: 2249
Issue Time: 2026 Jul 12 1411 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Jul 12 1410 UTC
Valid To: 2026 Jul 13 2100 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:
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.
______________________________________________________
Space Weather Message Code: ALTEF3
Serial Number: 3715
Issue Time: 2026 Jul 12 0532 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3714
Begin Time: 2026 Jul 10 1126 UTC
Yesterday Maximum 2MeV Flux: 4620 pfu
Yesterday's max: 4,620 pfu
Yesterday's max: 4,620 pfu
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Space Weather Message Code: ALTK04
Serial Number: 2673
Issue Time: 2026 Jul 12 0346 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jul 12 0259 UTC
Synoptic Period: 0000-0300
Active Warning: YES
Comment:
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.
______________________________________________________
Space Weather Message Code: ALTTP4
Serial Number: 714
Issue Time: 2026 Jul 12 0212 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Jul 12 0053 UTC
Comment:
______________________________________________________
Space Weather Message Code: ALTTP2
Serial Number: 1515
Issue Time: 2026 Jul 12 0211 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jul 12 0135 UTC
Estimate Velocity: 678 km/s
Comment:
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Space Weather Message Code: WARK04
Serial Number: 5383
Issue Time: 2026 Jul 12 0134 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jul 12 0135 UTC
Valid To: 2026 Jul 12 2359 UTC
Warning Conditions: Onset
Comment:
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.
______________________________________________________
Space Weather Message Code: ALTEF3
Serial Number: 3714
Issue Time: 2026 Jul 11 0501 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3713
Begin Time: 2026 Jul 10 1126 UTC
Yesterday Maximum 2MeV Flux: 2029 pfu
Yesterday's max: 2,030 pfu
Yesterday's max: 2,030 pfu
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Space Weather Message Code: WATA20
Serial Number: 1115
Issue Time: 2026 Jul 10 1946 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jul 11: None (Below G1) Jul 12: G1 (Minor) Jul 13: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:
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.
______________________________________________________
Space Weather Message Code: WARK04
Serial Number: 5382
Issue Time: 2026 Jul 10 1151 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5381
Valid From: 2026 Jul 09 1119 UTC
Now Valid Until: 2026 Jul 11 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.
______________________________________________________
Space Weather Message Code: ALTEF3
Serial Number: 3713
Issue Time: 2026 Jul 10 1126 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Jul 10 1126 UTC
Station: GOES-19
Comment: Yesterday's max: 767 pfu
Yesterday's max: 767 pfu
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Space Weather Message Code: ALTK04
Serial Number: 2672
Issue Time: 2026 Jul 09 1120 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Jul 09 1120 UTC
Synoptic Period: 0900-1200
Active Warning: YES
Comment:
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.
______________________________________________________
https://www.swpc.noaa.gov/products/alerts-watches-and-warnings