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PATTERN CHANGE | Pacific Northwest

Pattern change to clear out smoke, end Pacific NW dryspell


Friday, August 11, 2017, 10:59 - A nationwide pattern change is set to begin this weekend – first impacting the Pacific Northwest with cooler temperatures and potentially bringing an end to the longest streak of dry weather on record for Seattle.

“Low level onshore flow will gradually increase through Saturday,” says the National Weather Service Seattle office. “The change in the weather pattern will begin pushing the smoke out of the area [Friday] afternoon.”

Click Play to Watch below: Smoky conditions over Pacific Northwest may improve this weekend as winds aloft begin to shift.

RELATED: Nationwide pattern change brings cooler weather to west. Here's when it happens.

For areas along the coast, we could be looking at more than a 10 degree drop between Saturday and Sunday. 

Current forecast for Portland notes a temperature high of 81 F Saturday, down to temperatures in the high 60s by Sunday (see below). 

7 Day Forecast for Portland, OR, via theweathernetwork.com.

While it won’t be much, the best chance for showers will be Saturday night through the day Sunday as stronger upper level trough and associated front move across the area. Less than inch is forecast through the weekend (see below).

Click play to watch below: Rainfall track and timing

The rain will be a welcome change to a region that as of Tuesday (Aug. 8) evening, marked the 52nd consecutive day without measurable precipitation, surpassing the previous record of 51 days set in 1951. Seattle last recorded rainfall on June 17.

Critical fire weather continues across the Pacific Northwest. All campfires are restricted across central Oregon.

WATCH BELOW: What's the cause behind the big pattern change

Sources: NWS, SPC/NOAA

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