Space Weather Message Code: WARK04 Serial Number: 3928 Issue Time: 2021 Sep 08 1455 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3927 Valid From: 2021 Sep 08 0845 UTC Now Valid Until: 2021 Sep 08 2100 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: 2232 Issue Time: 2021 Sep 08 1007 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Sep 08 1006 UTC Synoptic Period: 0900-1200 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: 3927 Issue Time: 2021 Sep 08 0843 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Sep 08 0845 UTC Valid To: 2021 Sep 08 1500 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: ALTK04 Serial Number: 2231 Issue Time: 2021 Sep 08 0054 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Sep 08 0050 UTC Synoptic Period: 0000-0300 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: 3926 Issue Time: 2021 Sep 08 0036 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Sep 08 0035 UTC Valid To: 2021 Sep 08 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: 190 Issue Time: 2021 Sep 02 1821 UTC CANCEL WATCH: Geomagnetic Storm Category G2 Predicted Cancel Serial Number: 189 Original Issue Time: 2021 Aug 30 2039 UTC Comment: G2 (Moderate) geomagnetic storm conditions no longer expected. 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: WATA30 Serial Number: 189 Issue Time: 2021 Aug 30 2039 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Aug 31: None (Below G1) Sep 01: G1 (Minor) Sep 02: G2 (Moderate) 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. Induced

Space Weather Message Code: WARK05 Serial Number: 1609 Issue Time: 2021 Aug 28 0228 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1608 Valid From: 2021 Aug 27 1800 UTC Now Valid Until: 2021 Aug 28 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: 1336 Issue Time: 2021 Aug 28 0227 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Aug 28 0216 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: WARK04 Serial Number: 3925 Issue Time: 2021 Aug 28 0226 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3924 Valid From: 2021 Aug 27 1615 UTC Now Valid Until: 2021 Aug 28 1200 UTC Warning Condition: Pesistence 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 –