Space Weather Message Code: ALTK04 Serial Number: 2329 Issue Time: 2022 Dec 31 2205 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2022 Dec 31 2205 UTC Synoptic Period: 2100-2400 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: 4230 Issue Time: 2022 Dec 31 2040 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2022 Dec 31 2040 UTC Valid To: 2023 Jan 01 0600 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: 1419 Issue Time: 2022 Dec 30 1806 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2022 Dec 30 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: WARK04 Serial Number: 4229 Issue Time: 2022 Dec 30 1757 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4228 Valid From: 2022 Dec 29 2244 UTC Now Valid Until: 2022 Dec 31 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 –

Space Weather Message Code: ALTK05 Serial Number: 1418 Issue Time: 2022 Dec 30 1336 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2022 Dec 30 1336 UTC Synoptic Period: 1200-1500 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: 1728 Issue Time: 2022 Dec 30 1311 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2022 Dec 30 1309 UTC Valid To: 2022 Dec 30 1800 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: 4227 Issue Time: 2022 Dec 30 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4226 Valid From: 2022 Dec 29 2244 UTC Now Valid Until: 2022 Dec 30 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 –

Space Weather Message Code: ALTK05 Serial Number: 1417 Issue Time: 2022 Dec 30 0123 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2022 Dec 30 0122 UTC Synoptic Period: 0000-0300 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: 4226 Issue Time: 2022 Dec 30 0058 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4225 Valid From: 2022 Dec 29 2244 UTC Now Valid Until: 2022 Dec 30 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 –

Space Weather Message Code: ALTK04 Serial Number: 2328 Issue Time: 2022 Dec 29 2354 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2022 Dec 29 2354 UTC Synoptic Period: 2100-2400 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