Space Weather Message Code: WARK04 Serial Number: 3839 Issue Time: 2021 Feb 24 2343 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3838 Valid From: 2021 Feb 24 0600 UTC Now Valid Until: 2021 Feb 25 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: WARK05 Serial Number: 1578 Issue Time: 2021 Feb 24 2015 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Feb 24 2015 UTC Valid To: 2021 Feb 24 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: 3838 Issue Time: 2021 Feb 24 1757 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3837 Valid From: 2021 Feb 24 0600 UTC Now Valid Until: 2021 Feb 24 2359 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: WARK05 Serial Number: 1577 Issue Time: 2021 Feb 24 0830 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Feb 24 0830 UTC Valid To: 2021 Feb 24 1500 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: ALTK04 Serial Number: 2195 Issue Time: 2021 Feb 24 0816 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Feb 24 0815 UTC Synoptic Period: 0600-0900 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: 3836 Issue Time: 2021 Feb 24 0602 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Feb 24 0600 UTC Valid To: 2021 Feb 24 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: WARK04 Serial Number: 3835 Issue Time: 2021 Feb 23 0529 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3834 Valid From: 2021 Feb 22 2042 UTC Now Valid Until: 2021 Feb 23 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: ALTK04 Serial Number: 2194 Issue Time: 2021 Feb 23 0231 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Feb 23 0229 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: 3834 Issue Time: 2021 Feb 22 2042 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Feb 22 2042 UTC Valid To: 2021 Feb 23 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: WATA20 Serial Number: 884 Issue Time: 2021 Feb 22 1141 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Feb 23: G1 (Minor) Feb 24: G1 (Minor) Feb 25: None (Below G1) 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