A northwest flow aloft will remain over the Inland Northwest with just a slight chance of hit or miss showers near the Cascade Crest and Canadian border. Under mostly sunny skies, our weather today will cool off a bit with most highs ranging in the mid 40’s to mid-50’s with lighter winds through the period. Expect increasing mid and high-level clouds in advance of the of the next weather system through the night tonight as a deepening low-pressure system off the Washington and northern Oregon coast moves inland early Friday.
Ahead of this low, a moist southwest flow will interact with an arctic frontal boundary dropping south out of Canada. As a result, Winter Storm Watches have been issued across much of Northcentral Washington effective at 8:00 a.m. Friday and running through Saturday at 11:00 a.m. So, weather for Friday…precipitation will be slow to start, snow levels reaching down to most valley floors Friday morning before rising briefly to 1500-2500 feet in the afternoon. Most of Northcentral Washington should only pick up 1-2 inches of snow Friday morning. As our temperatures warm Friday afternoon, the Wenatchee Valley will see more of a rain/snow mix with afternoon high temperatures tomorrow in the lower 40’s.
Expect breezy to windy conditions to develop behind the arctic front passage on Saturday with a 40% chance of morning snow showers. Highs on Saturday are only expected to reach the high teens to high 20s with low to mid 30’s in the Wenatchee Valley and Columbia Basin. This is about 20 degrees below normal. Single digit wind chills are likely Saturday morning over most of North Central and Northeastern Washington.
Saturday night through Sunday, in the wake of the arctic front, brisk northeast winds will continue to funnel through the Purcell trench and the Okanogan Valley into the Columbia Basin. Light winds expected in the Wenatchee Valley Sunday with afternoon high temperatures still cold, only in the upper 30’s.
The large area of low pressure that caused all of the winter weather will slowly sink south on Monday allowing warmer weather to move into the Pacific Northwest throughout next week. Under mostly sunny skies, high temperatures will reach the mid-40’s on Monday, near 50 degrees on Tuesday and all the way up to the lower and mid 50’s on Wednesday.