Weather 10-4-18


A ridge of high pressure continues to sit off the west coast juxtaposed against a weather trof over the Western United States which will keep a cool northeast flow influencing Eastern Washington and Northern Idaho thru this forecast period. In addition to allowing for below normal temperatures there will be considerable cloudiness as disturbances track thru this flow and pass cloud shields of varying intensity over the forecast area through early next week. Today we can expect clearing skies and warmer temperatures with highs in the low to mid 60’s.

A weather disturbance dropping down through the flow will spread more clouds across the area Friday along with some precipitation primarily to the East Slopes of the North Cascades by Friday night. A thick cloud shield tracks over the region Friday night with the best chances for rain along and south of I-90. We have a 20% chance of showers late afternoon on Friday climbing to a 50% chance of rain on Friday night.

Weather models continue to show a break from the unsettled weather for Saturday and Sunday when we will be in-between weather systems, which will make for very nice weekend weather. Under sunny skies Saturday and Sunday, we will see high temperatures in the mid to upper 60’s.

A stronger weather system drops down from the north Monday and Tuesday with some Pacific moving down in the flow bringing moisture down the Pacific Coast.  There is a 20% chance for showers Monday afternoon, a 40% chance on Monday night and a 20% chance of scattered showers on Tuesday. High temperatures in the low 60’s.

Following the instability, Wednesday we can expect mostly sunny skies but cooler as a drier Canadian air mass moves in with high temperatures only in the upper 50’s.