Snowstorm Tonight

Snowstorm Tonight

The fashions have converged.  Uncertainty is much less.  A snowstorm will hit western Washington tomorrow.

But it will likely be a snowstorm with a twist: radical variations in snowfall inside a matter of tens of miles. 

The theme from the film JAWS needs to be taking part in as I present you the newest infrared satellite tv for pc picture (see beneath), with plenty of moisture prepared to maneuver in tonight.

Cool air is in place.  How a lot snow piles up is all about moisture ..or lack of lack of moisture.  It will begin snowing this night and can proceed by means of early afternoon tomorrow (Saturday).    

The whole snowfall predicted  by the UW high-resolution mannequin by means of 1 PM Saturday is proven beneath.

The contrasts are superb. The southern Sound (south of Tacoma) and the Kitsap will get pummeled with Eight inches to 1 and half toes of snowfall.  The southern Cascades will get a number of toes.  Portland, cooled by the outflow from the Columbia Gorge can be whitened by 4-Eight inches with some freezing rain combined in.

Read More:  What were the local weather impacts of the eruption of Mount St. Helens?

Seattle and central Puget Sound can be a examine in contrasts.  Near the Sound 3-6 inches of snowfall is probably going, dropping to a half inch over the acute japanese suburbs. 

Snowstorm Tonight
The newest NOAA/National Weather Service High Resolution Rapid Refresh forecast, began 6-h later than the UW mannequin, reveals an identical, however extra bountiful snow accumulation by means of Four PM Saturday.Not a lot snow in Bellingham and japanese WA escapes a lot of the snow motion.
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And the newest European Center mannequin forecast of whole snowfall by means of Four PM Saturday is comparable, however has much more snow.1613166822 415 Snowstorm Tonight

Why much less snow east of Puget Sound ? Downsloping easterly circulation, as air strikes in the direction of an approaching low strain space close to the southwest Washington coast.  Sinking air kills precipitation
What about uncertainty?   The NWS ensemble forecasts (operating the mannequin many occasions) are all on the identical web page for  SeaTac Airport snow, however the quantities vary from 4-12 inches.  The actual quantity relies upon critically on the precise place of the low heart approaching us and the quantity of easterly circulation.
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Late Sunday and Monday there can be extra snow, turning to rain on Monday.   But extra on that within the subsequent weblog.
Finally, I ought to word that the mountains are going to get an unbelievable quantity of snow in the course of the subsequent 5 days and avalanche hazard will improve.   Take a take a look at the European Center snowfall totals by means of Tuesday at Four PM.  4-6 toes within the mountains.  Lots of people have died from avalanches this yr…please watch out.
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