101
WWUS86 KSEW 110103
SPSSEW

Special Weather Statement
National Weather Service Seattle WA
603 PM PDT Fri May 10 2024

WAZ001-503-504-506-507-509>517-555-556-558-559-567>569-110700-
San Juan County-Western Whatcom County-Southwest Interior-
Western Skagit County-Everett and Vicinity-Tacoma Area-
Admiralty Inlet Area-Hood Canal Area-Lower Chehalis Valley Area-
Olympics-Eastern Strait of Juan de Fuca-
Western Strait of Juan De Fuca-North Coast-Central Coast-
East Puget Sound Lowlands-Bellevue and Vicinity-
Seattle and Vicinity-Bremerton and Vicinity-
West Slopes North Cascades and Passes-
West Slopes North Central Cascades and Passes-
West Slopes South Central Cascades and Passes-
603 PM PDT Fri May 10 2024

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

The NOAA Space Weather Prediction Center has observed extreme (G5)
geomagnetic conditions Friday afternoon and expects severe (G4)
conditions to continue through the weekend.

A geomagnetic storm of this strength can cause multiple and and
widespread issues with various power and communications systems.
Widespread voltage control problems may occur, and some power
grid systems may experience component failures, disruption of
service, and protective device trips. This could result in
blackouts.

GPS and other satellite navigation may be degraded for days.

HF/VHF/UHF radio propagation may be impossible in many areas for
one 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.gov
For weather information...visit www.weather.gov

&&

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www.weather.gov/seattle