The tremendous rain shadow occasion of the previous day resulted in startling precipitation contrasts over the area.
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The map beneath exhibits the 24h quantities ending at 11 AM this morning (click on to enlarge, and a blow up is beneath). A number of hundredths of an inch over north Seattle and northern Kitsap, however as a lot as 6 inches within the Cascade foothills, tens of miles away.
The forecast of 24-h precipitation ending at four PM at this time, exhibits the rain shadow and the immense precipitation on the decrease western slopes of the Cascades. And have a look at japanese Washington: an immense dry zone within the lee of the Cascades.
This enormous precipitation gradient was supercharged by sturdy westerly circulate related to a slender, however potent atmospheric river. And the air warmed significantly yesterday, leading to rain hitting the decrease passes. Such heavy precipitation within the Cascades, on prime of considerable snow of the previous few weeks, has led to a critical avalanche danger, with the Northwest Avalanche Center going for top to EXTREME. So critical that WSDOT closed down Stevens and Snoqualmie passes in a single day.
The native snowpack at present is effectively above regular, as proven by the SNOTEL community this morning:
And the snow forecast this week may be very aggressive, with 2-5 ft within the Cascades and Olympic by Friday night. Classic La Nina.
With the 8-14 day forecast from the Climate Prediction Center being colder than regular, the snow is just not going anyplace quickly (see beneath). So each summer season water sources and March snow enjoyable look to be in fine condition at this level.
Featured weblog on the Decline of Public Radio Station KNKX: https://cliffmass.blogspot.com/2021/02/the-progressive-decline-and.html