Varningar, Harney Holes

Special Weather Statement issued May 11 at 5:11AM PDT by NWS Pendleton OR The NOAA Space Weather Prediction Center has observed extreme (G5) geomagnetic conditions this morning and expect severe (G4) conditions to continue through the weekend. * A Geomagnetic Storm of this strength can cause multiple and widespread issues with various power and communication systems. * Widespread voltage control problems may occur; some power grid systems may experience component failures, disruption of service and protective device trips. This could result in blackouts. * Pipeline currents can reach hundreds of amps. * GPS and other satellite navigation may be degraded or unavailable for days. * High Frequency (HF) radio propagation may be impossible in many areas 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.gov For Weather Information visit...www.weather.gov