Space Weather Message Code: WARK05 Serial Number: 1587 Issue Time: 2021 Mar 21 1633 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Mar 21 1630 UTC Valid To: 2021 Mar 21 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: ALTK04 Serial Number: 2204 Issue Time: 2021 Mar 21 1423 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Mar 21 1423 UTC Synoptic Period: 1200-1500 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: 3864 Issue Time: 2021 Mar 21 1418 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Mar 21 1415 UTC Valid To: 2021 Mar 22 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: 3863 Issue Time: 2021 Mar 21 0543 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3862 Valid From: 2021 Mar 20 0250 UTC Now Valid Until: 2021 Mar 21 1300 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: WARK04 Serial Number: 3862 Issue Time: 2021 Mar 20 1455 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3861 Valid From: 2021 Mar 20 0250 UTC Now Valid Until: 2021 Mar 21 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: ALTK05 Serial Number: 1317 Issue Time: 2021 Mar 20 1104 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Mar 20 1104 UTC Synoptic Period: 0900-1200 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: ALTK06 Serial Number: 478 Issue Time: 2021 Mar 20 0803 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2021 Mar 20 0800 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G2 – Moderate 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 fluctuations can occur. High-latitude

Space Weather Message Code: ALTK05 Serial Number: 1317 Issue Time: 2021 Mar 20 1104 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Mar 20 1104 UTC Synoptic Period: 0900-1200 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: ALTK06 Serial Number: 478 Issue Time: 2021 Mar 20 0803 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2021 Mar 20 0800 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G2 – Moderate 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 fluctuations can occur. High-latitude

Space Weather Message Code: WARK06 Serial Number: 440 Issue Time: 2021 Mar 20 0721 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2021 Mar 20 0720 UTC Valid To: 2021 Mar 20 1200 UTC Warning Condition: Onset NOAA Scale: G2 – Moderate 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