A westerly flow continues over the region today with the jet stream aloft moving higher level moisture over the Pacific Northwest in the form of high cloud thickening this afternoon and evening. Winds will increase again along the east slopes of the Cascades and spread east into the Central Basin with gusts to 25 to 30 mph on average late afternoon and evening. These winds will stretch as far east as Mattawa, George, Quincy, Palisades and Waterville on the Waterville Plateau.
Mostly sunny skies on tap for Northcentral Washington today with increasing clouds late, highs this afternoon in the upper 70’s to lower 80’s.
Lots of sunshine for Thursday too with mostly sunny skies in the forecast and a northwest breeze 5-15 mph, highs tomorrow in the upper 70’s.
Friday will be our transition day from our current mild and dry weather regime to a showery and cooler pattern. The majority of Friday looks to be pleasant with above average temperatures into the upper 70’s and relatively light winds, but a broad trough organizing off the coast will spread an abundance of clouds across the Inland Northwest during the day and then a 30% chance for showers by Friday night.
By this weekend and into Monday a broad and slow-moving trough of low pressure languishes over the Pacific Northwest. The medium range weather models don`t produce much precipitation across central Washington Saturday, Sunday or Monday where we need it the most. The most generous rain amounts are expected over the Idaho Panhandle Saturday with our initial frontal surge and then again Monday under a potential deformation band as the upper low pivots into Montana.
Expect mostly cloudy skies each day this weekend with a 40% chance of rain showers on Saturday and a 30% chance on Sunday with afternoon high temperatures in the lower 70’s Saturday and only the upper 60’s on Sunday.
Seasonably breezy conditions are also expected through the weekend into Monday with 15 to 20 mph winds common across the Columbia Basin, Palouse, Wenatchee area, and West Plains as cool air spills over the Cascades into Central and Eastern Washington. We could see a few leftover showers Monday morning with partly cloudy skies by afternoon, highs near 70 degrees.
It looks like quiet weather for Tuesday with mostly sunny skies and afternoon temperatures slightly below normal in the lower 70’s.