Weather 9-12-19

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A ridge of high pressure will bring dry weather conditions and high clouds to Northcentral Washington today and along with sunny skies, expect high temperatures this afternoon in the lower 80’s. Winds will be light and generally under 10 mph from the south. The exception to this is the Okanogan Valley where they will see winds up to 20 mph with gusts up to 25 mph through the afternoon.

An upper level trough of low pressure along with a cold front will move inland this evening. The cold front will progress across the Wenatchee Valley through the night and into Friday morning. Northcentral Washington can expect mostly sunny skies early Friday with increasing clouds and wind out of the west 10-20 mph with highs tomorrow in the mid 70’s. Winds in the Columbia Basin will be stronger tomorrow between 15-25 mph with gusts to 30 mph. Weak high pressure will move into the Pacific Northwest from the west Friday evening behind the exiting storm system.

The flow will flatten out overnight and become westerly through the day on Saturday. There will be several weak short wave weather systems that will track from west to east through Southern B.C. and this will be the focus for continuing isolated to scattered showers for the Cascades and the northern mountain zones. Expect mostly cloudy skies for the Wenatchee Valley Saturday with a 30% chance of showers developing late in the day, high temperatures in the mid 70’s.

A larger low pressure system currently up in the Arctic will move off the British Columbia coast by Saturday night and gradually move inland on Monday. The low will linger over the region through Tuesday, then push east and out of the area during the day Wednesday. High pressure will once again strengthen in the eastern Pacific, and this will put the Inland Northwest in a dry and cool northwest flow. This pattern will result in another round of showers and thunderstorms, cooler temperatures and gusty winds at times through Wednesday.

For Sunday, cloudy skies with a 50% chance of showers and much cooler temperatures with highs only in the mid to upper 60’s.

There is a 20% chance for showers for both Monday and Tuesday with highs in the upper 60’s to lower 70’s.