Weather for the first half of the week will remain dry and cool in the Inland Northwest. Temperature variance will be small and possibly less than forecasted due to cloud coverage and patchy fog. Areas of fog will be our main concern for much of the region, especially the Columbia Basin and Wenatchee Valley, bringing lower ceilings and possible freezing fog to some areas this morning. So, expect cloudy skies in our Monday forecast, along with calm wind conditions, afternoon high temperatures today will be around normal for this time of year in the lower 30’s.
On Tuesday, boundary layer winds out of the southeast will bring drier air into the Palouse and Columbia Basin. Patchy fog will return overnight into tomorrow morning. However, with this drier air, most of the patchy fog will be limited to the Eastern Cascades and Northern Washington valleys. Highs on Tuesday in the lower to mid-30’s.
Our weather pattern changes on Wednesday with the arrival of a low pressure system. The Pacific Northwest will see a subtropical moisture plume sagging into the region bringing a wintry mix of precipitation that will start out as snow with a transition in the valleys to rain coupled with potential for some freezing rain in the lowlands near the East Slopes. Cloudy skies in our Wednesday Wenatchee Valley forecast with a 60% chance of snow with high temperatures in the mid 30’s.
Snowfall turns to a rain/snow mix on Thursday with a 70% chance of the wet stuff with highs in the mid to upper 30’s. Snowfall rates above 3500 feet Thursday night have potential to be quite high and result in substantial mountain snow accumulation.
Cloudy and breezy on Friday with a 70% chance of rain and high temperatures in the upper 30’s. Cloudy with a 50% chance of rain on Saturday with warm highs into the upper 30’s to near 40 degrees. Cloudy, mild and dry weather is expected for Sunday with afternoon highs in the upper 30’s.