Space Weather Message Code: ALTK07 Serial Number: 119 Issue Time: 2021 Nov 04 0934 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2021 Nov 04 0934 UTC Synoptic Period: 0900-1200 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: 486 Issue Time: 2021 Nov 04 0927 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2021 Nov 04 0926 UTC Synoptic Period: 0900-1200 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: 1347 Issue Time: 2021 Nov 04 0926 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Nov 04 0925 UTC Synoptic Period: 0900-1200 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: ALTK07 Serial Number: 118 Issue Time: 2021 Nov 04 0848 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2021 Nov 04 0848 UTC Synoptic Period: 0600-0900 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: 485 Issue Time: 2021 Nov 04 0733 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2021 Nov 04 0730 UTC Synoptic Period: 0600-0900 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: 1346 Issue Time: 2021 Nov 04 0711 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Nov 04 0708 UTC Synoptic Period: 0600-0900 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: ALTK05 Serial Number: 1345 Issue Time: 2021 Nov 04 0426 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Nov 04 0424 UTC Synoptic Period: 0300-0600 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: 3957 Issue Time: 2021 Nov 04 0244 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3956 Valid From: 2021 Nov 03 2005 UTC Now Valid Until: 2021 Nov 04 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: ALTK06 Serial Number: 484 Issue Time: 2021 Nov 04 0154 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2021 Nov 04 0154 UTC Synoptic Period: 0000-0300 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: 1344 Issue Time: 2021 Nov 04 0122 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Nov 04 0120 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.