A Wet Day Ahead

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by Mary Lee

Bio | Email | Follow: @MaryLeeKING5

KING5.com

Posted on August 25, 2013 at 8:56 PM

Updated today at 9:57 AM

TODAY:

Puget Sound Forecast: Rain at times, increasing this afternoon. Highs in the mid to upper 50's. South winds 5-15 mph, possibly to 20 mph along/near shorelines.

Coast Forecast: Rain at times, highs in the low to mid 50's. South to southwest winds 10-25 mph.

Mountain Forecast: Cloudy with a mix of rain and snow, generally above all but the highest pass elevations. Snow level 4,500 to 5,000'. Pass winds west-southwest 5-15 mph.

Eastern Washington Forecast: Mostly cloudy to cloudy with increasing rain, especially in the afternoon. Highs low 50's (Spokane and Pullman) to the mid 60's near the Tri Cities.

STILLAGUAMISH FLOODING CONCERNS:

A FLOOD WARNING REMAINS IN EFFECT FOR THE NORTH FORK OF THE STILLAGUAMISH EAST OF THE LANDSLIDE DUE TO POOLING OF THE BLOCKED RIVER.

Between 1 and 2" possible today. River levels could rise up to 4 feet by Thursday afternoon, then fall back close to current levels later Friday.

Extended Outlook/Discussion:

A new weather system is approaching the Pacific Northwest right now; we're in an area of warm (relatively speaking) and moist air. That will maintain occasional rain today. General accumulations will range from about 3/4 to 1-1/2 inches, with higher amounts along/near the Cascade foothills. As the cold front pushes inland late tonight, the widespread rain will change to showers.

A Puget Sound Convergence Zone could develop Friday morning; that would mean the most persistent showers will be likely over north King and Snohomish counties. But partial clearing will also be likely.

This weekend, the main storm track will be heading into central and south British Columbia; that's close enough that it will weaken a small ridge of high pressure, allowing for an increasing chance of showers in the mid to late afternoon. On Easter Sunday, prevailing winds in the upper atmosphere (what we often call 'steering currents') will drive another system toward us (again, the wettest weather will be in British Columbia), though is appears most of the rain will fall in the late afternoon to evening hours.

Mary Lee / KING 5 Meteorologist

 

 

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