Another Round of Heavy Rain, Flooding, Strong Winds and Snow Ahead in the Pacific Northwest

Linda Lam
Published: November 15,2015
Another round of heavy rain, mountain snow and strong winds will blast into the Pacific Northwest early this week.

Current Radar with Watches and Warnings

The region has already dealt with it's share of heavy rain in recent days.
One location on the windward side of Olympic National Park in Washington state saw over a foot of rain in two days at the end of this past week. Up to 19 inches of snow has been estimated in the Olympics near Hurricane Ridge during the 24 hours ending Sunday morning.
In the rain shadow of the Olympic Mountains, rainfall in the Seattle-Tacoma-Olympia corridor has been lighter. Seattle-Tacoma International Airport saw 4.45 inches of rain Thursday-Sunday evening.
This rain has already sent some rivers into moderate and briefly major flood levels, including the Snohomish and Snoqualmie Rivers, flooding roads and rural areas in the foothills of the Cascades east of Seattle.
(MORE: Thousands Lose Power, Flooding Reported)

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(INTERACTIVE: NWS Flood Alerts)
A cold front moved through Washington and Oregon on Sunday, bringing an end to the heaviest precipitation, but dropped snow levels in the Cascades and Olympics.
However, an active Pacific jet stream will remain aimed at the Northwest U.S. This will allow disturbances to move through the region bringing rounds of rain, heavy at times, that will drench the area west of the Cascades in Washington and Oregon starting again late Monday and continuing into Wednesday.
Snow levels will rise to 6,000 feet by Tuesday morning allowing for additional rainfall amounts of 5-8 inches (locally 10-13 inches) in the Olympic and Cascade mountains Monday-Wednesday. The National Weather Service has issued a flood watch for northwest Washington late Monday through Wednesday afternoon. This additional heavy rain may raise the risk of landslides in the region and result in more river flooding.

Flood Alerts

Rainfall Forecast

Another concern is the potential for strong winds, especially Tuesday, in western Washington, but that will depend on the exact track and intensity of a low pressure system moving into British Columbia.
Wind advisories have been posted for Monday and high wind watches have been issued for much of Washington for Tuesday. Wind gusts up to 75 mph are possible on Tuesday with gusts up to 90 mph in the mountains. If these strong winds do develop there is a high risk of trees being toppled due to the saturated soils from the recent heavy rainfall.

Wind Advisories, Watches and Warnings

With snow levels as low as 2,000 feet Monday morning, a winter storm warning has been issued for the Washington Cascades Monday morning into early Tuesday. The National Weather Service said 6 to 10 inches of snow was possible at pass level, including Stevens Pass and Snoqualmie Pass. As mentioned before, snow levels will then rise to at least 6,000 feet by Tuesday morning turning the precipitation to rain in many locations.
(MAPS: Interactive Radar)
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