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.

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