A Dry Out Summer

Western Washington's summers are nearly ever quite dry, simply this summertime is unusually so.  

At SeaTac Airport, nosotros are downward almost two inches from normal for the final 12 weeks (see below)

 And looking at the atmospheric precipitation anomaly (difference from normal) over the yesteryear ninety days for WA terra firma shows nigh normal atmospheric precipitation over the Columbia Basin, simply a dry out western Washington, alongside the windward slopes of the Cascades beingness roughly 3-5 inches below normal.

To larn roughly historical perspective, hither is the May to July atmospheric precipitation for Washington State since 1930.  This yr was non a tape low, simply was i of the driest years during that period.  Overall, in that place has non been much a long-term tendency inward early on summertime precipitation, simply nosotros convey had a drier than normal piece the final few years.

The practiced intelligence is that the models are showing the supply of low-cal pelting to our area.

For example, hither is the forecast cumulative atmospheric precipitation through adjacent Fri using the UW WRF model.  Decent pelting inward British Columbia, which is rattling good--can tending dampen downward the fires.  And western Washington gets moistened, especially the western side of the Cascades.

Regarding the vacation weekend, it should locomote dry out through sun night, simply in addition to thus a upper degree trough moves in.  So hold back roughly low-cal showers Mon AM that volition locomote over yesteryear noon.

And in addition to thus on Th a strong upper trough approaches (see below)...expect substantial cloudiness in addition to roughly pelting afterwards on Th into Friday.  In short, normal weather condition are back.  Heat waves in addition to smoke are inward our rear-view mirror.