Alertes en vigueurSiler, WA

The NOAA Space Weather Prediction Center has observed extreme (G5)geomagnetic conditions early Saturday morning and expects severe(G4) conditions to continue through the weekend.A geomagnetic storm of this strength can cause multiple and andwidespread issues with various power and communications systems.Widespread voltage control problems may occur, and some powergrid systems may experience component failures, disruption ofservice, and protective device trips. This could result inblackouts.GPS and other satellite navigation may be degraded for days.HF/VHF/UHF radio propagation may be impossible in many areas forone to two days.Low-frequency radio navigation can be out for hours.Aurora may be visible at much lower latitudes.For space weather information...visit www.swpc.noaa.govFor weather information...visit www.weather.gov