Space Weather Message Code: WARK07 Serial Number: 99 Issue Time: 2024 Mar 24 1543 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2024 Mar 24 1543 UTC Valid To: 2024 Mar 25 0600 UTC Warning Condition: Onset NOAA Scale: G3 or greater 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: ALTK06 Serial Number: 551 Issue Time: 2024 Mar 24 1531 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2024 Mar 24 1526 UTC Synoptic Period: 1500-1800 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: 1563 Issue Time: 2024 Mar 24 1517 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Mar 24 1516 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: 550 Issue Time: 2024 Mar 24 1445 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2024 Mar 24 1444 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

Space Weather Message Code: ALTK05 Serial Number: 1562 Issue Time: 2024 Mar 24 1443 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Mar 24 1443 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: WARK04 Serial Number: 4571 Issue Time: 2024 Mar 24 1434 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4570 Valid From: 2024 Mar 23 0415 UTC Now Valid Until: 2024 Mar 25 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: WARSUD Serial Number: 220 Issue Time: 2024 Mar 24 1426 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2024 Mar 24 1430 UTC Valid To: 2024 Mar 24 1500 UTC IP Shock Passage Observed: 2024 Mar 24 1411 UTC NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation

Space Weather Message Code: WARK04 Serial Number: 4570 Issue Time: 2024 Mar 24 0855 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4569 Valid From: 2024 Mar 23 0415 UTC Now Valid Until: 2024 Mar 24 2100 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: 1561 Issue Time: 2024 Mar 24 0301 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 Mar 24 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: 549 Issue Time: 2024 Mar 23 2322 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2024 Mar 23 2320 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