Space Weather Message Code: ALTK04 Serial Number: 2344 Issue Time: 2023 Feb 23 0236 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Feb 23 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: 4289 Issue Time: 2023 Feb 23 0146 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Feb 23 0145 UTC Valid To: 2023 Feb 23 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

Space Weather Message Code: WARK04 Serial Number: 4288 Issue Time: 2023 Feb 21 1459 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4287 Valid From: 2023 Feb 21 0248 UTC Now Valid Until: 2023 Feb 22 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 –

Space Weather Message Code: WARK05 Serial Number: 1745 Issue Time: 2023 Feb 21 1452 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1744 Valid From: 2023 Feb 21 1010 UTC Now Valid Until: 2023 Feb 21 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK04 Serial Number: 2343 Issue Time: 2023 Feb 21 1031 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Feb 21 1028 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

Space Weather Message Code: WARK04 Serial Number: 4287 Issue Time: 2023 Feb 21 1013 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4286 Valid From: 2023 Feb 21 0248 UTC Now Valid Until: 2023 Feb 21 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 –

Space Weather Message Code: WARK05 Serial Number: 1744 Issue Time: 2023 Feb 21 1010 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 Feb 21 1010 UTC Valid To: 2023 Feb 21 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: WARK04 Serial Number: 4286 Issue Time: 2023 Feb 21 0247 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Feb 21 0248 UTC Valid To: 2023 Feb 21 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

Space Weather Message Code: ALTK05 Serial Number: 1428 Issue Time: 2023 Feb 16 1802 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 Feb 16 1759 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.

Space Weather Message Code: WARK05 Serial Number: 1743 Issue Time: 2023 Feb 16 1443 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1742 Valid From: 2023 Feb 16 0436 UTC Now Valid Until: 2023 Feb 17 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 60 degrees Geomagnetic Latitude. Induced Currents –