Latest Alerts


    1. 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.

    1. 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.

    1. 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.

    1. 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.

    1. 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.

    1. 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.