Space Weather Message Code: WARK04 Serial Number: 4615 Issue Time: 2024 May 19 1320 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2024 May 19 1320 UTC Valid To: 2024 May 19 2359 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: 999 Issue Time: 2024 May 18 1952 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: May 19: None (Below G1) May 20: G1 (Minor) May 21: 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: WARK05 Serial Number: 1884 Issue Time: 2024 May 18 0556 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1883 Valid From: 2024 May 17 1305 UTC Now Valid Until: 2024 May 18 1200 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: WARK06 Serial Number: 526 Issue Time: 2024 May 17 2301 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 525 Valid From: 2024 May 17 1901 UTC Now Valid Until: 2024 May 18 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 55 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: ALTK05 Serial Number: 1597 Issue Time: 2024 May 17 2235 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 May 17 2230 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: 4614 Issue Time: 2024 May 17 2156 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4613 Valid From: 2024 May 17 1300 UTC Now Valid Until: 2024 May 18 1200 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: 1883 Issue Time: 2024 May 17 2156 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1882 Valid From: 2024 May 17 1305 UTC Now Valid Until: 2024 May 18 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: ALTK06 Serial Number: 573 Issue Time: 2024 May 17 1929 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2024 May 17 1928 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: WARK06 Serial Number: 525 Issue Time: 2024 May 17 1902 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2024 May 17 1901 UTC Valid To: 2024 May 17 2359 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: ALTK05 Serial Number: 1596 Issue Time: 2024 May 17 1834 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2024 May 17 1834 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.