Not a whole lot of weather changes or surprises for this period of the forecast over what has been advertised over the last few forecast cycles. It is going to get quite warm for this time of year as an upper level low visible on satellite spinning in the Gulf of Alaska pumps warm moist air into the region on the southwesterly flow ahead of it. No records are expected to be threatened…but high temperatures will increase by 5 to 7 degrees each day through Friday into Saturday.
Northcentral Washington can expect high clouds at times with a light west wind, afternoon high temperatures today into the mid and upper 80’s.
Friday looks unseasonably warm as well with mostly cloudy skies and a 30% chance of showers and t-storms as a second upper level low visible on satellite off the coast of Baja California gets caught up in the southwesterly flow and moves abundant moisture our direction. High temperatures on Saturday will top out near 90 degrees.
By Saturday night, while still three days away, there is remarkably good and consistent overall agreement depicting the transit of an upper level trough moving southwest to northeast through the forecast area Saturday evening with a strong surface cold front. The air mass compliments of the very high moisture content and daytime heating will be very unstable as this front approaches and passes. This is a recipe for a rather violent transition period Saturday evening for much of the forecast area featuring a good chance of scattered strong and possibly severe thunderstorms. There is an 80% chance of rain and thunderstorms Saturday night.
Behind the weather system on Sunday there may be a leftover shower with mostly sunny skies by afternoon and cooler with high temperatures in the lower to mid-70’s.
Monday through Wednesday, the Columbia Basin and Wenatchee Valley can expect partly cloudy to mostly sunny skies with highs in the upper 70’s on Monday and lower 80’s on Tuesday and Wednesday.