NOAA space weather extended warning: Geomagnetic K-index of 4 expected

Official SWPC message K04W · Valid From: 2026 Jul 15 0143 UTC · Now Valid Until: 2026 Jul 15 1500 UTC · Other recent messages: Alert: Geomagnetic K-index of 4; Warning: Geomagnetic K-index of 4 expected; Continued Alert: Electron 2MeV Integral Flux exceeded 1000pfu.