Our quiet weather pattern will come to an end starting later today for parts of Eastern Washington as a winter storm system moves in from the northwest. The storm looks to be moving down more into Eastern Washington than in our area with the Cascade valleys (Winthrop, Leavenworth) not expected to see much snow, and the Western Basin (Wenatchee, Omak, Moses Lake) will be largely dry, with a possible dusting of snow. The Palouse and Spokane areas will see the most snow, possibly up to 6 inches by Wednesday morning. The Wenatchee Valley today can expect cloudy skies, a 20% chance of scattered snow showers with afternoon high temperatures in the mid 30’s.
Northcentral Washington will see a 30% chance of rain showers Wednesday night as another warm front slides through with overnight lows in the mid 30’s. This front will also tap into a decent atmospheric moderate to heavy precipitation near the Cascade crest on Thursday. We will see cloudy skies with a 60% chance of rain, breezy winds at times and warmer high temperatures into the mid and upper 40’s. Additionally, expect locally breezy conditions over the higher Cascades and then over the deeper Columbia Basin, the Palouse southward into the Blues and Camas Prairie. Winds of 10-15 mph with gusts of 25-35 mph will be possible, especially around and just downwind of the Blue Mountains.
Thursday night into Friday the overall threat of precipitation wanes, with a weak ridge of high pressure building in. Expect patchy fog throughout Northcentral Washington to start the day Friday with mostly cloudy skies and a 30% chance of rain by Friday night as the next storm system makes its way across the region.
Overall it will ramp up the precipitation threat again Saturday, before it winds down again Saturday night. The Wenatchee area will see mostly cloudy skies Saturday with a 40% chance of rain and afternoon highs in the mid 40’s. The system will also come with some breezy conditions and those impacts looks potentially broader than the Thursday system. The highest threat will be in the unsheltered zones, with speeds of 10-15 mph and gusts to around 25-30 mph.
Then Sunday and Monday looks drier and overall cooler as high pressure builds in with mostly sunny to sunny to sunny skies with afternoon high temperatures both days in the mid 40’s.