Weather 9-18-20


The long-awaited area of low pressure will finally begin to press into the region and will also begin to push out the smoke that has been plaguing the state for the past week or more. Air quality will slowly improve today with a greater push on Saturday as the low pushes a cold front through the Inland Northwest. Weather models are in decent agreement with the timing of widespread light precipitation beginning this afternoon. The amounts of rain overall are expected to be around a tenth of an inch or less. However, some showers could bring heavy downpours that could bring possible flash flooding issues for recent burn scars across parts of Northcentral Washington by this afternoon. Winds will also creep higher with the passage of the low with gusts climbing into the low 20’s for the parts of the Columbia Basin and Waterville Plateau.

Under hazy skies, expect increasing cloudiness through the day with a 20% chance of showers today and a 40% chance tonight, afternoon highs will generally be in the mid to upper 70’s.

Maybe a sprinkle or two as we kick off the weekend on Saturday then partly cloudy skies by afternoon a bit breezy with highs in the upper 70’s.

The upper level trough moves out of the area on Sunday bringing back the breathable air that the Western U.S. has been longing for. By Sunday afternoon, weather models are in agreement that the Inland Northwest will generally be in a westerly zonal flow. Under sunny skies, highs on Sunday will once again be in the upper 70’s.

Quiet weather for Monday too with mostly sunny skies and highs in the mid to upper 70’s.

By Tuesday afternoon, the upper level flow becomes southwesterly ahead of an approaching weather system. The Columbia Basin and Wenatchee Valley will see increasing clouds throughout the day with afternoon high temperatures in the upper 70’s.

The large upper level trough moves onshore Wednesday bringing chances for showers and breezy winds for the Cascades by late Wednesday and across the Inland Northwest through Thursday. Northcentral Washington forecast for Wednesday and Thursday will be mostly cloudy each day with a 30% chance of rain Wednesday night and a 50% chance on Thursday, highs once again primarily in the mid to upper 70’s.