Northcentral Washington weather today will feature high pressure building out in the Eastern Pacific. This will put the Inland Northwest in a dry north-northeast flow today. This will keep a dry and cool northeast flow over the region through Friday. For this morning, the surface pressure gradient has tightened enough for gusty winds down the Okanogan valley and to a lesser extent the Purcell trench. Sustained northerly winds of 15-25 mph with gusts 25-30 mph and locally to 40 mph can be expected down the Okanogan valley and spilling out onto the Waterville Plateau and the deep Columbia Basin through most of the day. In the Wenatchee Valley, winds will not be an issue today with west wind 5-10 mph, sunny skies with afternoon high temperatures in the mid 40’s. Same scenario for Thursday with lots of sunshine and highs in the mid 40’s.
The large ridge of high pressure flattens as a weak weather wave moves through on Friday. There is virtually no moisture associated with it, so no precipitation is expected with this feature. The main impact will be it flattening the ridge and opening up the Inland Northwest to a more progressive pattern. So, increasing clouds in our Friday forecast with high temperatures once again in the mid 40’s.
By the weekend on Saturday, a wave of low pressure will move into Western Canada. This weather system may produce some very light snow in the Cascades with a 20% chance of rain in Northcentral Washington with highs in the mid 40’s.
Morning rain showers are a possibility on Sunday with mostly sunny conditions by afternoon with highs once again in the mid 40’s.
On Monday we transition to a more active weather pattern for our Thanksgiving week. Mostly cloudy skies are expected on Monday with a slight chance of isolated snow showers developing late, highs in the lower 40’s. The chance for snow goes up to 40% on Tuesday with cooler high temperatures only in the upper 30’s.