FLASH FLOOD WATCH ISSUED FOR THE EAST SLOPES OF THE NORTH CASCADES, THE WEST EDGE OF THE OKANOGAN VALLEY AND THE WENATCHEE AREA. IT WILL BE IN EFFECT WEDNESDAY MORNING THROUGH WEDNESDAY EVENING.
Mostly cloudy to cloudy with increasing areas of rain. Lows in the mid to upper 50's.
Puget Sound Forecast: Mostly cloudy to cloudy with periods of rain-moderately heavy at times. A chance of afternoon thundershowers with small hail, locally gusty winds. Highs in the mid 60's to near 70.
Coast Forecast: Cloudy with rain at times; a chance of a few thundershowers. Highs low to mid 60's, southeast winds to 10 mph.
Mountain Forecast: Mostly cloudy to cloudy with increasing showers and possibly thundershowers. Heavy rain is possible at times. Snow level 9-10,000'. Pass highs in the mid 50's to low 60's, winds becoming west at 10-20 mph.
Eastern Washington Forecast: Mostly cloudy with showers and thundershowers, especially along or near the east slopes of the Cascades. Highs in the upper 70's to upper 80's.
An unseasonably strong low pressure system is moving south along the British Columbia coast. It will continue to slide southeast toward the Washington coast Wednesday, and then move across Washington tomorrow night into Thursday morning. Widespread showers are expected Wednesday with isolated thunderstorms in the afternoon and evening. Rainfall will be moderate to even heavy with rainfall amounts more than half an inch to even higher amounts-an inch or more-along the coast and the Cascades.
The Flash Flood Watch I mentioned at the beginning of this forecast is in response to concerns over the potential for moderate to heavy rain falling on burn scars from this years fires, or those left by wildfires in 2012 and 2013. With little or no vegetation to stabilize hill or mountainsides, there's a definite threat of mudslides or debris slides.
Showers will linger Thursday morning, but diminish during the afternoon hours. As high pressure rebuilds along the coast, we're likely to see a mix of morning clouds and partly sunny skies in the afternoon Friday. Some morning clouds are possible Saturday, but skies should become mostly sunny-persisting into Monday. Highs will warm into the 80's Sunday and Monday.
Jeff Renner / KING 5 Chief Meteorologist