‘Atmospheric river’ to produce heavy rainfall - KIRO Seattle

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SEATTLE — With increasing rain this Wednesday evening, the heavier showers will push in through Friday morning.

This is the leading edge of an atmospheric river – a plume of very rich moisture coming from the southwest across the Pacific north of Hawaii. This will produce copious rainfall on Thursday across the area, with the Olympic Peninsula and coast and the northern half of the Western Washington interior (mainly along and north of Interstate 90) in line for the heavier rainfall.

>>Download the KIRO 7 Weather App for real-time radar updates

Expect rainfall of 1-2 inches around Puget Sound from Wednesday night through Thursday, with isolated higher amounts. This will lead to some urban flooding where any storm drains are clogged, something we will have to contend with until the leaves are all gone.

>>Urban flooding a concern with heavy rain on the way, here’s how you can help

In the mountains, 2-5 inches of rain will fall, with snow levels way up there above 7,000 feet, so no snow at the passes. In fact some locations in the Olympic Mountains and North Cascades could receive even more rain — around 3-4 inches — pushing rivers to near flood stage by Thursday night.

>>StormTracker Doppler Radar Livestream

The Skokomish River in Mason County — our most flood-prone river — is already in minor flood stage and will reach moderate flood stage on Thursday. The rivers flowing out of the Central and North Cascades (I-90 north, including the Snoqualmie River) have a decent chance of reaching minor flood stage for the first time this season late Thursday or early Friday. This is not looking like a major flooding event as the atmospheric river will quickly move south Thursday night into Friday, but still a good soaker.

Winds on Thursday will be gusting in the 20-35 mph range with isolated gusts up to 40 mph. No watches, warnings or advisories for wind are expected, because these wind speeds are pretty typical of stormy days in October.

WEEKEND OUTLOOK

We’ll quickly see rain move south away from the area Friday morning, and by Friday afternoon we could be drying out as high pressure aloft builds in.

>>KIRO PinPoint 7-Day Forecast

The upcoming weekend including Halloween looks to be very nice, with more sunshine after morning fog or low clouds. Highs will be in the 50s through the next week, though over the weekend morning lows will be chilly — in the 30s.

Weather into early next week looks pretty quiet, so we just have to get past this one last bout of heavy rain Thursday before smoother sailing for a while.

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‘Atmospheric river’ to produce heavy rainfall - KIRO Seattle
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