Mid and high clouds are moving in from the west early this morning ahead of a cold front that will traverse the region today. A relatively warm boundary layer should allow temperatures to warm back near similar values as Monday. The weak frontal system is trending to be less impressive when it comes to rainfall amounts. The weather system will bring precipitation to the central and the eastern portions of the state late morning /mid-day with Northcentral Washington expecting cloudy skies, a 70% chance of rain today with afternoon high temperatures in the mid 50’s.
Wednesday will be a quiet weather day with partly cloudy skies and unseasonably warm temperatures with highs tomorrow in the lower to mid-60’s.
A trough of low pressure moves in on Thursday bringing a west wind 10-15 mph, a 50% chance of showers and afternoon high temperatures in the upper 50’s. The Columbia Basin will see the strongest wind around 15-25 mph. Area rivers are expected to rise due to the heavy rainfall with the storms this week. At this time, no rivers are expected to surpass action stage.
By Friday our pattern begins to stabilize ahead of much colder air that will drop down on Northcentral Washington this weekend. Under partly cloudy skies Friday, expect afternoon highs in the lower 50’s.
Significant weather changes on Saturday as high pressure builds into the Pacific Northwest causing a trough to pinch its way into the state. With this trough, a strong northerly flow will bring cold Canadian air into the region. We will have a sharp drop in temperatures as cold Canadian air will funnel down the Okanogan valley into the Wenatchee Valley and western Columbia Basin.
Weather forecast for the weekend and on Monday, expect mostly sunny skies each day with highs on Saturday in the mid to upper 40’s, lower to mid-40’s on Sunday and still unseasonably cold on Monday too with afternoon high temperatures only in the lower 40’s.