Space Weather Message Code: WATA20 Serial Number: 898 Issue Time: 2021 Aug 27 2103 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Aug 28: G1 (Minor) Aug 29: G1 (Minor) Aug 30: G1 (Minor) 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 Currents

Space Weather Message Code: ALTK04 Serial Number: 2230 Issue Time: 2021 Aug 27 1754 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Aug 27 1750 UTC Synoptic Period: 1500-1800 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: 1608 Issue Time: 2021 Aug 27 1753 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Aug 27 1800 UTC Valid To: 2021 Aug 28 0300 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: 3924 Issue Time: 2021 Aug 27 1614 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Aug 27 1615 UTC Valid To: 2021 Aug 28 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: WARK04 Serial Number: 3923 Issue Time: 2021 Aug 15 0759 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Aug 15 0800 UTC Valid To: 2021 Aug 15 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: ALTK04 Serial Number: 2227 Issue Time: 2021 Jul 22 0901 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Jul 22 0900 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: ALTK04 Serial Number: 2227 Issue Time: 2021 Jul 22 0901 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Jul 22 0900 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: ALTK05 Serial Number: 1335 Issue Time: 2021 Aug 02 2026 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Aug 02 2026 UTC Synoptic Period: 1800-2100 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: WARK05 Serial Number: 1607 Issue Time: 2021 Aug 02 2000 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Aug 02 1959 UTC Valid To: 2021 Aug 02 2359 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: 3922 Issue Time: 2021 Aug 02 1959 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3921 Valid From: 2021 Aug 02 1715 UTC Now Valid Until: 2021 Aug 03 0300 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 –