Space Weather Message Code: WARK06 Serial Number: 514 Issue Time: 2024 Apr 16 2309 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2024 Apr 16 2309 UTC Valid To: 2024 Apr 17 0300 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

Space Weather Message Code: WARK05 Serial Number: 1865 Issue Time: 2024 Apr 16 2255 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1864 Valid From: 2024 Apr 16 1909 UTC Now Valid Until: 2024 Apr 17 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 4588 Issue Time: 2024 Apr 16 2254 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4587 Valid From: 2024 Apr 15 2306 UTC Now Valid Until: 2024 Apr 17 0900 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: 1567 Issue Time: 2024 Apr 16 2245 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Apr 16 2239 UTC Synoptic Period: 2100-2400 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: WATA20 Serial Number: 998 Issue Time: 2024 Apr 16 2123 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Apr 17: None (Below G1) Apr 18: G1 (Minor) Apr 19: 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.

Space Weather Message Code: ALTK05 Serial Number: 1566 Issue Time: 2024 Apr 16 1912 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Apr 16 1910 UTC Synoptic Period: 1800-2100 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: 1864 Issue Time: 2024 Apr 16 1909 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2024 Apr 16 1909 UTC Valid To: 2024 Apr 16 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: 4587 Issue Time: 2024 Apr 16 1424 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4586 Valid From: 2024 Apr 15 2306 UTC Now Valid Until: 2024 Apr 16 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: 1863 Issue Time: 2024 Apr 16 1108 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2024 Apr 16 1108 UTC Valid To: 2024 Apr 16 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: WARK04 Serial Number: 4586 Issue Time: 2024 Apr 16 0556 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4585 Valid From: 2024 Apr 15 2306 UTC Now Valid Until: 2024 Apr 16 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 –