Space Weather Message Code: WARK04 Serial Number: 4887 Issue Time: 2025 Mar 25 0320 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2025 Mar 25 0330 UTC Valid To: 2025 Mar 25 1530 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

Space Weather Message Code: WATA30 Serial Number: 247 Issue Time: 2025 Mar 24 1107 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Mar 24: G1 (Minor) Mar 25: G2 (Moderate) Mar 26: 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

Space Weather Message Code: WARK05 Serial Number: 1999 Issue Time: 2025 Mar 24 0411 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2025 Mar 24 0410 UTC Valid To: 2025 Mar 24 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

Space Weather Message Code: ALTK04 Serial Number: 2538 Issue Time: 2025 Mar 24 0235 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2025 Mar 24 0233 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

Space Weather Message Code: WARK04 Serial Number: 4886 Issue Time: 2025 Mar 24 0129 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2025 Mar 24 0129 UTC Valid To: 2025 Mar 24 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

Space Weather Message Code: WARSUD Serial Number: 241 Issue Time: 2025 Mar 24 0028 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2025 Mar 24 0030 UTC Valid To: 2025 Mar 24 0130 UTC IP Shock Passage Observed: 2025 Mar 24 0017 UTC NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation

Space Weather Message Code: ALTK05 Serial Number: 1725 Issue Time: 2025 Mar 22 2337 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 Mar 22 2337 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.

Space Weather Message Code: WARK04 Serial Number: 4885 Issue Time: 2025 Mar 22 2305 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4884 Valid From: 2025 Mar 21 1715 UTC Now Valid Until: 2025 Mar 23 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 –

Space Weather Message Code: WARK04 Serial Number: 4884 Issue Time: 2025 Mar 22 1649 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4883 Valid From: 2025 Mar 21 1715 UTC Now Valid Until: 2025 Mar 22 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 –

Space Weather Message Code: WARK05 Serial Number: 1997 Issue Time: 2025 Mar 22 1648 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2025 Mar 22 1648 UTC Valid To: 2025 Mar 22 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