It will be another cold weather day for the Inland Northwest as the large trough of low pressure in the Southwest U.S. continues to be in place. There will be a good deal of cloudiness across the majority of Northcentral Washington today along with light winds, high temperatures this afternoon will only top out in the lower 30’s.
On Tuesday, more light snow will likely fall over Eastern Washington as remnants of a moist frontal system crashing into British Columbia combined with persistent warm advection over the north Idaho Panhandle will lead to good chances for bands of light snow near the Canadian border. For the Wenatchee Valley tomorrow, expect cloudy skies, light southeast wind with afternoon high temperatures warming into the mid 30’s.
By tomorrow night, a light wintry mix will be possible into Wednesday morning over portions of Northcentral Washington as moisture crosses the Cascades. At this time, precipitation amounts look to be very light in our typical “precipitation shadow”. But if any precipitation does fall around Wenatchee, Chelan, Grand Coulee, or Waterville overnight Tuesday into early Wednesday, it could even be a bit of light freezing rain. Chance of precipitation in the Wenatchee area is only 20%.
There may be a light sprinkle Wednesday morning with cloudy skies by afternoon with high temperatures above normal near 40 degrees. A flat ridge of high pressure spans the Inland Northwest on Wednesday as minor shortwave weather systems roll across British Columbia. Weather for Northcentral Washington Wednesday and Thursday calling for morning fog giving way to cloudy afternoon skies, highs in the upper 30’s to lower 40’s.
For Friday through the upcoming weekend, the weather pattern becomes a bit more unsettled as the ridge of high pressure aloft breaks down as a Pacific weather system approaches. A frontal boundary pushes east of the Cascades on Friday with a 40% chance of rain mixed with snow showers and afternoon highs near 40 degrees.
By Saturday, the upper level trough moves inland and weakens as it slips south of the region, but still keeps the threat of showers region-wide through the weekend. High temperatures both Saturday and Sunday in the lower 40’s.