There will be one more day of mild Fall weather. Then expect the weather pattern to change beginning Saturday afternoon as the first of several weak disturbances moves through the Inland Northwest. A fast moving cold front is speeding into Northwest Washington this morning and satellite imagery shows it shearing apart as it moves into the ridge of high pressure that’s been parked in the Eastern Pacific for days now. Little if any moisture is associated with this front and we kept the forecast dry today with sunny skies and afternoon high temperatures in the mid 40’s.
A flat west-northwest flow will be over the Pacific Northwest Saturday and Sunday as multiple weak weather disturbances continue to breakdown the ridge. A warm front will sag into the region Saturday afternoon with a cold front following Sunday mid-day. Pacific moisture deepens quite a bit late Saturday afternoon as the area of low pressure moves to our south. The Wenatchee Valley can expect a 30% chance of rain showers by Saturday night with high temperatures in the upper 40’s. The Cascades will see a quarter to a half inch of rain with close to an inch near the crest. Snow levels will fluctuate quite a bit, but for areas above about 4000-4500 feet storm total snow will be 2-4 inches for the Northeast and Panhandle mountains. The Cascades will do better with 3-6 inches with 6-8 inches near the Cascade crest. Winds will also be on the increase Saturday and Sunday afternoon with sustained west-northwest winds 10-15 mph and gusts 20-30 mph. High temperatures Monday in the lower 40’s.
Tuesday through Thanksgiving Thursday, weather models remain in strong agreement of a shift in the weather pattern next week as temperatures take a nose dive this with afternoon high temperatures cooling from the upper 30s and 40s on Monday to the upper 20s and 30s by Wednesday and Thursday. The cold, continental air mass will drive snow levels to the valleys floors and the focus for the upcoming holiday week will be on when and where we could see snow. For now, Northcentral Washington will see mostly cloudy skies Tuesday through Thanksgiving with a 30% chance of snow each day, little accumulation expected.