Latest Alerts
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ALERT: Geomagnetic K-index of 4 K04A
Space Weather Message Code: ALTK04
Serial Number: 2549
Issue Time: 2025 Apr 19 0227 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 19 0227 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.
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WARNING: Geomagnetic K-index of 4 expected K04W
Space Weather Message Code: WARK04
Serial Number: 4931
Issue Time: 2025 Apr 19 0219 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 19 0218 UTC
Valid To: 2025 Apr 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.
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ALERT: Type II Radio Emission TIIA
Space Weather Message Code: ALTTP2
Serial Number: 1411
Issue Time: 2025 Apr 19 0007 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 Apr 18 2345 UTC
Estimated Velocity: 349 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.
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WARNING: Geomagnetic K-index of 5 expected K05W
Space Weather Message Code: WARK05
Serial Number: 2024
Issue Time: 2025 Apr 18 0448 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 18 0447 UTC
Valid To: 2025 Apr 18 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.
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ALERT: Geomagnetic K-index of 4 K04A
Space Weather Message Code: ALTK04
Serial Number: 2548
Issue Time: 2025 Apr 18 0402 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 18 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.
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WARNING: Geomagnetic K-index of 4 expected K04W
Space Weather Message Code: WARK04
Serial Number: 4930
Issue Time: 2025 Apr 18 0152 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 18 0152 UTC
Valid To: 2025 Apr 18 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.