Space Weather Message Code: WATA50 Serial Number: 74 Issue Time: 2024 Mar 23 1840 UTC WATCH: Geomagnetic Storm Category G3 Predicted Highest Storm Level Predicted by Day: Mar 24: G2 (Moderate) Mar 25: G3 (Strong) Mar 26: 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 50 degrees Geomagnetic Latitude. Induced Currents

Space Weather Message Code: WARK04 Serial Number: 4568 Issue Time: 2024 Mar 23 1754 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4567 Valid From: 2024 Mar 23 0415 UTC Now Valid Until: 2024 Mar 24 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: 4567 Issue Time: 2024 Mar 23 1155 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4566 Valid From: 2024 Mar 23 0415 UTC Now Valid Until: 2024 Mar 23 1800 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: 1558 Issue Time: 2024 Mar 23 0904 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Mar 23 0859 UTC Synoptic Period: 0600-0900 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: ALTK05 Serial Number: 1557 Issue Time: 2024 Mar 23 0537 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Mar 23 0536 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: WARK05 Serial Number: 1857 Issue Time: 2024 Mar 23 0523 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2024 Mar 23 0523 UTC Valid To: 2024 Mar 23 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

Space Weather Message Code: ALTK04 Serial Number: 2434 Issue Time: 2024 Mar 23 0512 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2024 Mar 23 0512 UTC Synoptic Period: 0300-0600 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: 4566 Issue Time: 2024 Mar 23 0414 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Mar 23 0415 UTC Valid To: 2024 Mar 23 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: WATA20 Serial Number: 992 Issue Time: 2024 Mar 22 2013 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Mar 23: None (Below G1) Mar 24: None (Below G1) Mar 25: 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: WARK04 Serial Number: 4565 Issue Time: 2024 Mar 22 1155 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4564 Valid From: 2024 Mar 21 0304 UTC Now Valid Until: 2024 Mar 22 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 –