Space Weather Message Code: WATA20 Serial Number: 1021 Issue Time: 2024 Dec 24 1747 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 25: G1 (Minor) Dec 26: G1 (Minor) Dec 27: None (Below G1) 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 60 degrees Geomagnetic Latitude. Induced

Space Weather Message Code: WATA20 Serial Number: 1020 Issue Time: 2024 Dec 23 2058 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 24: None (Below G1) Dec 25: G1 (Minor) Dec 26: None (Below G1) 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 60 degrees Geomagnetic Latitude.

Space Weather Message Code: WARK04 Serial Number: 4784 Issue Time: 2024 Dec 23 1723 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Dec 23 1730 UTC Valid To: 2024 Dec 23 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: ALTK04 Serial Number: 2510 Issue Time: 2024 Dec 23 0301 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2024 Dec 23 0259 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: 4783 Issue Time: 2024 Dec 22 2302 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Dec 22 2302 UTC Valid To: 2024 Dec 23 0900 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: 4782 Issue Time: 2024 Dec 21 2354 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4781 Valid From: 2024 Dec 21 2059 UTC Now Valid Until: 2024 Dec 22 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: 2509 Issue Time: 2024 Dec 21 2102 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2024 Dec 21 2059 UTC Synoptic Period: 1800-2100 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: 4780 Issue Time: 2024 Dec 21 0135 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Dec 21 0133 UTC Valid To: 2024 Dec 21 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

Space Weather Message Code: ALTK04 Serial Number: 2508 Issue Time: 2024 Dec 20 0301 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2024 Dec 20 0300 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: 4779 Issue Time: 2024 Dec 20 0058 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Dec 20 0057 UTC Valid To: 2024 Dec 20 0900 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