Space Weather Message Code: WATA20 Serial Number: 879 Issue Time: 2021 Jan 03 2044 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jan 04: None (Below G1) Jan 05: None (Below G1) Jan 06: 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 60 degrees Geomagnetic Latitude.

Space Weather Message Code: WATA20 Serial Number: 878 Issue Time: 2020 Dec 24 2102 UTC CANCEL WATCH: Geomagnetic Storm Category G1 Predicted Cancel Serial Number: 877 Original Issue Time: 2020 Dec 22 1818 UTC Comment: Conditions no longer warrent this Watch. 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

Space Weather Message Code: WARK04 Serial Number: 3799 Issue Time: 2020 Dec 24 1555 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2020 Dec 24 1553 UTC Valid To: 2020 Dec 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: WARK04 Serial Number: 3798 Issue Time: 2020 Dec 23 0433 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3797 Valid From: 2020 Dec 21 2220 UTC Now Valid Until: 2020 Dec 23 1800 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: 3797 Issue Time: 2020 Dec 22 2055 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3796 Valid From: 2020 Dec 21 2220 UTC Now Valid Until: 2020 Dec 23 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WATA20 Serial Number: 877 Issue Time: 2020 Dec 22 1818 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 23: G1 (Minor) Dec 24: G1 (Minor) Dec 25: 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: WARK04 Serial Number: 3796 Issue Time: 2020 Dec 22 1455 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3795 Valid From: 2020 Dec 21 2220 UTC Now Valid Until: 2020 Dec 22 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 65 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3795 Issue Time: 2020 Dec 22 0554 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3794 Valid From: 2020 Dec 21 2220 UTC Now Valid Until: 2020 Dec 22 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 –

Space Weather Message Code: WARK05 Serial Number: 1567 Issue Time: 2020 Dec 21 2322 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2020 Dec 21 2320 UTC Valid To: 2020 Dec 22 0300 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: 2181 Issue Time: 2020 Dec 21 2314 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2020 Dec 21 2311 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