Space Weather Message Code: WARK04 Serial Number: 5003 Issue Time: 2025 Jun 14 1723 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 5002 Valid From: 2025 Jun 11 1710 UTC Now Valid Until: 2025 Jun 15 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: 1819 Issue Time: 2025 Jun 14 0453 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 Jun 14 0453 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: ALTK05 Serial Number: 1818 Issue Time: 2025 Jun 14 0302 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 Jun 14 0259 UTC Synoptic Period: 0000-0300 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: 650 Issue Time: 2025 Jun 13 2330 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2025 Jun 13 2328 UTC Synoptic Period: 2100-2400 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: 1817 Issue Time: 2025 Jun 13 2223 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 Jun 13 2220 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: WARK04 Serial Number: 5002 Issue Time: 2025 Jun 13 2054 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 5001 Valid From: 2025 Jun 11 1710 UTC Now Valid Until: 2025 Jun 14 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: ALTK06 Serial Number: 649 Issue Time: 2025 Jun 13 2014 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2025 Jun 13 2013 UTC Synoptic Period: 1800-2100 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: 1816 Issue Time: 2025 Jun 13 1916 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 Jun 13 1916 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: ALTK05 Serial Number: 1815 Issue Time: 2025 Jun 13 1656 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 Jun 13 1656 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: ALTK06 Serial Number: 648 Issue Time: 2025 Jun 13 1356 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2025 Jun 13 1356 UTC Synoptic Period: 1200-1500 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