An Atmospheric River is forecasted to impact Washington through Thursday. It’s already dropped a few feet of snow on the mountains in the PNW. Persistent snowfall is expected to impact the area Tonight – Thursday.
“Showers linger through Wednesday. Our next storm system arrives Wednesday night – Thursday with another round of breezy to gusty winds! Stay tuned for more details over the next day or so!”
– NOAA Seattle, WA
Snow levels are forecasted to hover between 3,000ft and 4,000ft, before dropping towards the end of the storm.
The 6-10 day outlook calls for above average precipitation and below average temperatures in Washington.
Additional Storm Info:
Washington: 10-20″ of Snow Tonight – Thursday
Area Forecast Discussion National Weather Service Seattle WA 916 AM PST Wed Dec 19 2018 .SYNOPSIS...A strong frontal system will bring rain and windy conditions tonight and Thursday. Weak high pressure aloft will bring mostly dry weather Friday and Saturday. A second frontal system will bring another round of rain and wind Saturday night and Sunday. There will be a chance of showers Monday and Tuesday with a broad upper trough over the area. && .SHORT TERM /TODAY THROUGH FRIDAY/...Weak high pressure aloft will bring a relatively quiet weather day today with just a few showers and mostly cloudy skies. A strong frontal system will move through the area tonight and Thursday. High wind is a good bet at the coast and north interior with a deep surface tracking inland over central Vancouver Island around midday. High wind is also possible further south over the Puget Sound area later in the day as the low moves inland and the OLM-BLI gradient pops up to around +10MB. There will also be a strong push of westerlies down the Strait of Juan de Fuca late Thursday as the low moves inland. Winds will ease all areas Thursday night. Snow levels should rise high enough tonight that snow in the mountains won`t be a big concern although Mount Baker could get advisory amounts. Things will dry out quickly Thursday night behind the front with an upper ridge moving over the area on Friday. Schneider .LONG TERM /SATURDAY THROUGH TUESDAY/...Previous discussion...A quick moving shortwave trough will carry moisture into Washington Friday night into early Saturday. Rain showers associated with this system look to decrease in coverage through the day as the next ridge briefly tries to build across the area ahead of another strong Pacific storm system. A strong low looks to barrel into the Pacific Northwest Saturday night and Sunday, carrying with it another threat for heavy rain and wind. At this point in time this system looks similar to previous systems so will have to keep an eye on potential impacts as time gets closer. There could be a brief break Sunday night but another storm system seems likely right in time for Christmas Eve. Beginning to see some disagreement between ECMWF and GFS but looking at ensemble guidance /EPS GEMS and GEFS/ it looks like the ECMWF may be a little too aggressive at this point. Regardless, strong troughing looks imminent and at this point looks to linger through Christmas Day. Could see a break after this system, which would be much appreciated as a ridge tries to build into the region.