The Inland Northwest will remain in an active weather pattern through the weekend and into early next week, with at least two modest opportunities for precipitation interspersed with maybe a few sprinkles. Friday weather for Northcentral Washington will be mostly cloudy with a 20% chance of light showers, highs in the lower 70’s.
By late Saturday, a better chance of precipitation moves across the region as a fairly vigorous weather system swings onshore. Forecast tomorrow will be mostly sunny at first with increasing clouds in the afternoon and warmer with highs in the upper 70’s. By around midnight on Saturday we will also see a 40% chance of rain developing.
Between Saturday night and Sunday, the offshore trough becomes more north-to-south oriented, with the flow following suit. As it does so, additional shortwaves of moisture orbiting the offshore trough bring a renewed risk for showers to the Cascades and Northcentral Washington along with warm temperatures. Weather for Sunday will be cloudy with a 40% chance of showers and maybe a thunderstorm with high temperatures in the upper 70’s. The chance for rain goes up to 50% on Sunday night.
On Monday and Tuesday, the Inland Northwest will be under deep southwest flow aloft drawing a rich plume of subtropical moisture inland. Expect mostly cloudy skies with a 30% chance of rain each day but warm with afternoon high temperatures in the lower 80’s. We may also see windy conditions Tuesday as the weather system moves east.
By Wednesday and especially Thursday, the low will be departing into the Canadian Plains bringing us a dry, westerly flow with sunny skies and warmer temperatures with highs on Wednesday in the lower 80’s and into the upper 80’s by Thursday.