A forecast combination of strong winds, low humidity and dry fuels has prompted the National Weather Service to issue a red flag warning for a large portion of Western Washington from Thursday morning to Friday evening.
A red flag warning means that weather conditions could contribute to active fire behavior that would spread rapidly, the National Weather Service said on Wednesday. The affected area includes most of King County, the Cascades from about Enumclaw and Stampede Pass on south, the east side of the Olympic Mountains and the Northwest Olympic Peninsula.
A strong east wind will begin through the Cascades and across a large portion of Western Washington late Wednesday night and will continue through Thursday and Friday. Wind gusts of 25 to 40 mph near the Cascades and Northeast Olympic Peninsula are possible on Thursday.
Humidity will be around 20 to 30 percent on Thursday and Friday, the Weather Service said. A single day of dry wind will push fuels, especially light fuels, into the critically dry category.