Weather 9-9-20

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Warm, dry, and quiet weather returns to the area as high pressure begins to push inland. Smoke from local and regional fires will continue to impact most Northcentral Washington, especially around the Okanogan and Methow Valleys and the east slopes of the Cascades. Patchy smoke will also be prevalent around the Columbia Basin and Wenatchee Valley areas. Air quality will remain an issue as light winds will allow smoke to build near the ongoing fires. However, these light winds will be beneficial for fire- fighting efforts. Temperatures quickly warm up following a cooler start to the week and will be around 6 to 10 degrees above normal for early September. Under sunny weather conditions, afternoon highs around Northcentral Washington today will climb into the mid-80s and into the upper 80’s and low 90’s on Thursday.

The heat returns for the end of the week on Friday as high pressure that is just offshore once again builds inland. At this point Friday looks rather hot for mid-September, with afternoon high temperatures in the lower to mid-90s under sunny skies.

As we get to the weekend, both Saturday and Sunday will be sunny with unseasonably hot afternoon highs into the lower to mid-90’s.

Meanwhile, weather models are pointing to a change in the weather pattern with the potential for our first autumn rain. A cut off low is presently in the eastern Pacific and the computer models all suggest that this low could get picked up by the jet stream to the north and pushed into the Pacific Northwest.

The first big change in our weather will be in the form of a marine push of cooler air on Monday, compliments of the first Pacific short wave. This will bring with it about 5-8 degrees of cooling along with some breezy afternoon winds. High temperatures on Monday will generally be in the mid 80’s. By Monday night, Northcentral Washington will see partly to mostly cloudy skies with a 20% chance of widely scattered shower.

Tuesday will be cooler too as the weak weather system moves inland. Expect partly cloudy skies, a 20% chance of showers and afternoon high temperatures in the lower 80’s.