Space Weather Message Code: ALTK05 Serial Number: 1569 Issue Time: 2024 Apr 19 1552 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Apr 19 1550 UTC Synoptic Period: 1500-1800 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: 1867 Issue Time: 2024 Apr 19 1416 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1866 Valid From: 2024 Apr 19 0900 UTC Now Valid Until: 2024 Apr 19 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1568 Issue Time: 2024 Apr 19 1415 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Apr 19 1414 UTC Synoptic Period: 1200-1500 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: 1866 Issue Time: 2024 Apr 19 0900 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2024 Apr 19 0900 UTC Valid To: 2024 Apr 19 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: ALTK04 Serial Number: 2439 Issue Time: 2024 Apr 19 0750 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2024 Apr 19 0745 UTC Synoptic Period: 0600-0900 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: 4589 Issue Time: 2024 Apr 19 0648 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 Apr 19 0650 UTC Valid To: 2024 Apr 19 1800 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: 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.