Weather 2-18-21

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Our Thursday starts with early morning patchy freezing fog across parts of the Wenatchee Valley and the Columbia Basin. It is expected to dissipate by mid-morning as the region braces for the next wave of snow. A low-pressure system is currently pushing through the Gulf of Alaska breaking down the ridge of high pressure that’s been stationed in the Eastern Pacific over the past couple of days. This will allow a zonal flow pattern to pull in a large swath of moisture into the Pacific Northwest, especially on Sunday and Monday. The first wave of moisture is expected to begin impacting the Cascades by mid-morning and slowly slide East throughout the day. The bulk of the moisture is expected to pass through Oregon while Northcentral Washington will be on the northern edge leading to less amounts of snow.

Weather forecast for today calling for cloudy skies with a 70% chance of snow this afternoon and evening with high temperatures mainly in the mid 30’s. Most of Northcentral Washington will see around 1-2” of snow.

By Friday, another ridge of high pressure begins to build off the coast and cuts off the moisture flow. It will lead to a drying trend and bring a brief break between weather systems as another one is expected later in the weekend. Expect partly to mostly cloudy skies tomorrow with a slight chance for showers and warmer with highs in the lower 40’s.

The weekend will kick off Saturday with a zonal west-northwesterly flow aloft with mainly partly cloudy skies throughout the day and warmer with afternoon highs in the lower to mid-40’s.

The Atmospheric River aims right at the Pacific Northwest by Sunday and Monday bringing warmer temperatures with highs in the upper 40’s and lower 50’s and a 40-50% chance of rain each day.

Drier weather for Tuesday and Wednesday with partly cloudy to mostly sunny skies and afternoon high temperatures between 45-50 degrees.