872
WWUS86 KPDT 110346
SPSPDT

Special Weather Statement
National Weather Service Pendleton OR
846 PM PDT Fri May 10 2024

WAZ024-110700-
Eastern Columbia River Gorge of Washington-
Including the city of White Salmon
846 PM PDT Fri May 10 2024

...EXTREME GEOMAGNETIC CONDITIONS OBSERVED AND CONTINUED SEVERE
GEOMAGNETIC STORM EXPECTED TO CONTINUE THROUGH THE WEEKEND...

The NOAA Space Weather Prediction Center has observed extreme (G5)
geomagnetic conditions Friday afternoon 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

$$