Space Weather Message Code: WATA20 Serial Number: 888 Issue Time: 2021 Mar 17 2033 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 18: None (Below G1) Mar 19: None (Below G1) Mar 20: 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.

Space Weather Message Code: ALTK04 Serial Number: 2202 Issue Time: 2021 Mar 14 2302 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Mar 14 2301 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: 3860 Issue Time: 2021 Mar 14 2253 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3859 Valid From: 2021 Mar 14 1925 UTC Now Valid Until: 2021 Mar 15 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: WARK04 Serial Number: 3859 Issue Time: 2021 Mar 14 1926 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Mar 14 1925 UTC Valid To: 2021 Mar 14 2359 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: ALTK05 Serial Number: 1315 Issue Time: 2021 Mar 14 0553 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2021 Mar 14 0550 UTC Synoptic Period: 0300-0600 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: 3858 Issue Time: 2021 Mar 14 0430 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3857 Valid From: 2021 Mar 13 2230 UTC Now Valid Until: 2021 Mar 14 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 –

Space Weather Message Code: ALTK04 Serial Number: 2201 Issue Time: 2021 Mar 14 0001 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2021 Mar 13 2359 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: 3857 Issue Time: 2021 Mar 13 2233 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2021 Mar 13 2230 UTC Valid To: 2021 Mar 14 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: 3856 Issue Time: 2021 Mar 13 0554 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3855 Valid From: 2021 Mar 12 1918 UTC Now Valid Until: 2021 Mar 13 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: WARK05 Serial Number: 1584 Issue Time: 2021 Mar 13 0550 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2021 Mar 13 0550 UTC Valid To: 2021 Mar 13 1200 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