The mild and wet weather pattern continues with a series of storm systems tracking into the region from the southwest. The first system in the form of an occluded front will track across Eastern Washington today bringing widespread rain and high mountain snow to Northcentral Washington by tonight. Expect cloudy skies today with morning fog, highs this afternoon in the lower 40’s in the Wenatchee Valley and lower 50’s for parts of the Columbia Basin.
For tonight and Saturday, a mid-level wave passing through will increase our chance for rain up to 60% with afternoon highs on Saturday in the lower 40’s.
Saturday night and Sunday, an even stronger weather system arrives as a surface low deepens just off the Washington coast. This is expected to bring widespread precipitation into Northcentral Washington especially overnight Saturday night into Sunday with an 80% chance of rain and high temperatures on Sunday in the mid 40’s. Moderate snow accumulations of 6 to 10 inches are also likely in the mountains. Snow amounts around Winthrop, Stehekin, and Lake Wenatchee are a tougher call as surface temperatures may have a hard time dropping down to freezing Saturday night before precipitation arrives due to abundant boundary layer moisture and stratus limiting temperature falls. Most weather models suggest the Methow Valley will be cold enough for snow, with a rain/snow mix more likely for the Leavenworth and Lake Wenatchee areas. Wet snow may also occur on the Waterville Plateau and near the Canadian border before snow levels rise.
There is a subtle change in the overall weather pattern for the start of next week. Instead of weather systems coming at us from the southwest, they will be more from the west, thus they will be a little cooler, for a little better chance of low-elevation snow, mainly in the late night and morning hours. Not looking for anything appreciable even if it does occur. Northcentral Washington weather Monday through next week calling for mostly cloudy to cloudy skies with a 30-50% chance of rain with afternoon high temperatures generally in the lower to mid-40’s.