Space Weather Message Code: WARK04 Serial Number: 3873 Issue Time: 2021 Apr 07 1439 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3872 Valid From: 2021 Apr 07 0930 UTC Now Valid Until: 2021 Apr 07 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: 2209 Issue Time: 2021 Apr 07 1029 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Apr 07 1029 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: 3872 Issue Time: 2021 Apr 07 0929 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Apr 07 0930 UTC Valid To: 2021 Apr 07 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: WARK04 Serial Number: 3871 Issue Time: 2021 Apr 01 0118 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Apr 01 0118 UTC Valid To: 2021 Apr 01 0900 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: 893 Issue Time: 2021 Mar 29 1053 UTC CANCEL WATCH: Geomagnetic Storm Category G1 Predicted Cancel Serial Number: 892 Original Issue Time: 2021 Mar 26 2155 UTC Comment: G1 (Minor) geomagnetic storm conditions are no longer warranted under the currently forecasted solar wind regime. 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

Space Weather Message Code: WARK05 Serial Number: 1589 Issue Time: 2021 Mar 27 2351 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Mar 27 2351 UTC Valid To: 2021 Mar 28 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: ALTK04 Serial Number: 2208 Issue Time: 2021 Mar 27 2349 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Mar 27 2349 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: WARK04 Serial Number: 3870 Issue Time: 2021 Mar 27 2348 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Mar 27 2348 UTC Valid To: 2021 Mar 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: WATA20 Serial Number: 892 Issue Time: 2021 Mar 26 2155 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 27: None (Below G1) Mar 28: G1 (Minor) Mar 29: 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

Space Weather Message Code: ALTK04 Serial Number: 2207 Issue Time: 2021 Mar 26 0151 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Mar 26 0151 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