Alertes en vigueurStehekin, 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 andwidespread issues with various power and communication systems.* Widespread voltage control problems may occur; some power gridsystems may experience component failures, disruption of serviceand protective device trips. This could result in blackouts.* Pipeline currents can reach hundreds of amps.* GPS and other satellite navigation may be degraded orunavailable for days.* High Frequency (HF) radio propagation may be impossible in manyareas for one or 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