Space Weather Message Code: ALTK04 Serial Number: 2226 Issue Time: 2021 Jul 14 1641 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Jul 14 1631 UTC Synoptic Period: 1500-1800 UTC Active Warning: No 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: 3917 Issue Time: 2021 Jul 14 1639 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Jul 14 1639 UTC Valid To: 2021 Jul 15 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: 3916 Issue Time: 2021 Jul 01 0009 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3915 Valid From: 2021 Jun 30 1726 UTC Now Valid Until: 2021 Jul 01 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: ALTK04 Serial Number: 2225 Issue Time: 2021 Jun 30 2101 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Jun 30 2059 UTC Synoptic Period: 1800-2100 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: 3915 Issue Time: 2021 Jun 30 1724 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Jun 30 1726 UTC Valid To: 2021 Jul 01 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: 3914 Issue Time: 2021 Jun 25 0234 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Jun 25 0233 UTC Valid To: 2021 Jun 25 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: WARK05 Serial Number: 1606 Issue Time: 2021 Jun 16 0255 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1605 Valid From: 2021 Jun 15 2055 UTC Now Valid Until: 2021 Jun 16 0900 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1334 Issue Time: 2021 Jun 15 2101 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Jun 15 2100 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: ALTK04 Serial Number: 2224 Issue Time: 2021 Jun 15 2058 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Jun 15 2057 UTC Synoptic Period: 1800-2100 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: 3911 Issue Time: 2021 Jun 15 1339 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Jun 15 1345 UTC Valid To: 2021 Jun 15 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