Space Weather Message Code: ALTK07 Serial Number: 117 Issue Time: 2021 Nov 04 0001 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2021 Nov 03 2359 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G3 – Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents – Power system voltage irregularities possible, false

Space Weather Message Code: ALTK06 Serial Number: 483 Issue Time: 2021 Nov 03 2205 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2021 Nov 03 2146 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G2 – Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents – Power grid fluctuations can occur. High-latitude

Space Weather Message Code: ALTK05 Serial Number: 1343 Issue Time: 2021 Nov 03 2138 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Nov 03 2124 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: WARK06 Serial Number: 448 Issue Time: 2021 Nov 03 2134 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2021 Nov 03 2135 UTC Valid To: 2021 Nov 04 0300 UTC Warning Condition: Onset NOAA Scale: G2 – Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents – Power grid

Space Weather Message Code: ALTK04 Serial Number: 2248 Issue Time: 2021 Nov 03 2109 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Nov 03 2100 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: WARK05 Serial Number: 1618 Issue Time: 2021 Nov 03 2002 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Nov 03 2005 UTC Valid To: 2021 Nov 04 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: WARK04 Serial Number: 3956 Issue Time: 2021 Nov 03 1952 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Nov 03 2005 UTC Valid To: 2021 Nov 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: WATA30 Serial Number: 197 Issue Time: 2021 Nov 03 1318 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Nov 04: G2 (Moderate) Nov 05: None (Below G1) Nov 06: 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 55 degrees Geomagnetic Latitude.

Space Weather Message Code: WATA20 Serial Number: 904 Issue Time: 2021 Nov 02 1902 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Nov 03: G1 (Minor) Nov 04: G1 (Minor) Nov 05: 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: 3955 Issue Time: 2021 Nov 02 0526 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3954 Valid From: 2021 Nov 01 2135 UTC Now Valid Until: 2021 Nov 02 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 –