Space Weather Message Code: WARK05 Serial Number: 1622 Issue Time: 2021 Dec 19 2223 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Dec 19 2222 UTC Valid To: 2021 Dec 20 0600 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: 2255 Issue Time: 2021 Dec 19 1801 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Dec 19 1759 UTC Synoptic Period: 1500-1800 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: 3984 Issue Time: 2021 Dec 19 1749 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Dec 19 1748 UTC Valid To: 2021 Dec 20 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: WARK04 Serial Number: 3983 Issue Time: 2021 Dec 11 0501 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Dec 11 0502 UTC Valid To: 2021 Dec 11 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: 3982 Issue Time: 2021 Dec 03 1933 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Dec 03 1933 UTC Valid To: 2021 Dec 04 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: WARK04 Serial Number: 3981 Issue Time: 2021 Dec 02 0714 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Dec 02 0715 UTC Valid To: 2021 Dec 02 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: WARK04 Serial Number: 3980 Issue Time: 2021 Dec 01 2241 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Dec 01 2240 UTC Valid To: 2021 Dec 02 0300 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: 3979 Issue Time: 2021 Dec 01 0539 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3978 Valid From: 2021 Nov 30 2141 UTC Now Valid Until: 2021 Dec 01 1200 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: 1349 Issue Time: 2021 Nov 30 2239 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Nov 30 2238 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: WARK05 Serial Number: 1621 Issue Time: 2021 Nov 30 2150 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Nov 30 2150 UTC Valid To: 2021 Dec 01 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