Space Weather Message Code: ALTK04
Serial Number: 2374
Issue Time: 2023 May 22 2049 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2023 May 22 2042 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Aurora – Aurora may be visible at high latitudes such as Canada and Alaska.