Weather 9-17-19

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Considerably cool and unsettled weather on tap today as a large upper level trof of low pressure influences Central and Eastern Washington. The outer edges of this weather system are positioned overhead by this afternoon allowing for some gusty south and southwest winds mainly during the afternoon that may precede the rain or accompany it for a spell. Northcentral Washington today can expect cloudy skies and a 90% chance of rain developing by late morning, high temperatures only around 60 degrees.

On Wednesday, showers will persist as well as slow moving thunderstorms with a 40% chance of precipitation with high temperatures in the mid 60’s. With this in mind there is the potential hazards of lightning, downpours, and localized flooding for Wednesday. Lingering low level moisture from past and expected rainfall will also allow for some late night and early morning fog in the more favorable areas such as the northern valleys.

For Thursday and Friday, the upper trough axis will slowly move eastward allowing for drying and warmer weather conditions for the end of the week. The Wenatchee Valley will see mostly sunny to sunny skies both days with afternoon high temperatures mainly in the lower 70’s.

A weak upper level ridge of high pressure builds in on Saturday bringing dry daytime conditions with highs in the lower to mid-70’s. Unsettled weather is likely to return Sunday into early next week as the next weather system arrives, flattening the upper ridge.

Cloudy skies for Sunday with a 40% chance of scattered rain showers with highs in the lower 70’s. Back to sunshine on Monday with light winds, highs will top out in the lower 70’s.