As an atmospheric river brings heavy rain to Vancouver Island into Tuesday and early Wednesday, we’re just going to get some increasing cloud cover around Western Washington. Most locations mainly cloudy to cloudy to start Tuesday will also come with milder morning temperatures, so frost won’t be as much a concern. There could be some patchy fog, mainly in valleys nearer the Cascades and south.
By daybreak Tuesday, expect some spotty light showers mainly along the Strait, the north coast and through the San Juans and Whatcom County. Elsewhere, we should get through Tuesday without rainfall. Highs will only be in the upper 50s north to the low 60s south.
As the atmospheric river dies out Wednesday, it will sink south, but by then the event will have wrapped up. I don’t expect anything more than a few sprinkles around on Wednesday around the Sound though there could still be some light rain across the Olympic Peninsula.
Another ridge of high pressure aloft builds across the west by week’s end and with more sunshine, we’ll see highs in the upper 60s to mid 70s on Thursday and Friday. One more “burst” of late summerlike weather is on the way!
But it won’t last as rain showers and cooler air move back into the area by Saturday.
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