A moist southwest weather flow will continue through tonight before the trough axis swings inland Friday. The southwest flow will favor the highest precipitation totals through Friday morning along the Cascade crest with 2-3 inches of liquid precipitation forecast. For Northcentral Washington today, expect cloudy skies with a 60% chance of daytime rainfall with afternoon high temperatures in the mid to upper 30’s. The chance of precipitation goes up to 90% tonight with up to .25” of rain possible.
After a morning shower or two on Friday, the Wenatchee valley can expect mostly cloudy skies and mild temperatures with daytime highs in the lower to mid-40’s. By Friday night, the upper level flow becomes westerly and a weak wave of moisture ripples through Northcentral Washington with light snow across the northern mountains and a rain/snow mix for the valleys and lowlands. There is a 60% chance of rain Friday night with mild overnight low temperatures in the mid to upper 30’s.
A stronger and wetter system arrives from the southwest on Saturday, spreading precipitation across the Inland Norwest. There is a 60% chance of rain on Saturday with highs around 40 degrees, a 70% chance of precipitation Saturday night and a 60% chance of more rain activity on Sunday with afternoon high temperatures both days in the mid 40’s. Breezy southwest winds develop across the Columbia Basin Sunday afternoon and evening. The latest rounds of mild temperatures with rain and high mountain snow will increase some snowmelt, although current snow pack looks to be able to absorb the bulk of it.
For Monday through Wednesday, more weather disturbances track through the Inland Northwest with a strong jet stream guiding a series of Pacific disturbances. Temperatures and snow levels remain on the warm side of seasonal levels. Mountains will receive more rounds of snow, although the precipitation in the valleys will be dependent on the time of day with a better chance of snow during the overnight and early morning hours. Weather models show signs of another atmospheric river of moisture headed our way by mid-week with a return of mild and wet weather.