Friday, September 7, 2018

Statewide forecast — Sept. 7: It’s blowing away this weekend. Well, almost.

Western WA is largely free of smoke and will stay that way through early next week. Some light smoke from the Maple fire could potentially hit areas north of Seattle, but not expecting anything worse than spotty, short-lived Moderate conditions.

Weekend forecast for eastern WA
Southwest winds are picking up but haven't yet delivered much clean air yet. Present air quality runs the gamut from Good to Unhealthy. More greens will start appearing on the map as the day progresses, starting from the southwest. However some fire growth is expected as winds ramp up.

The southwest winds will die down on Saturday, allowing smoke from fires in the Washington Cascades to flow into nearby communities. Chelan and Okanogan Counties are likely to take a beating again (sorry!) and there is an Air Quality Alert through Sunday morning to address this. Air could be as bad as Very Unhealthy at times.

Eastern WA will also lie downwind of Oregon wildfires this weekend, although models are not advertising large smoke intrusions. Winds pick up again on Sunday with the possibility of some rain (YEAH!!!), alleviating air quality concerns somewhat. Here's what the UW weather models show for 24-hr total precipitation, ending at 5AM Monday. Over 1" in high terrain! Too optimistic?

All in all, areas to the south and east of a line from Goldendale to Spokane can expect mostly Good air this weekend. Yakima to Wenatchee could see periods of Moderate or even Unhealthy for Sensitive Groups. Other than Chelan and Okanogan, north central and north eastern counties could see air ranging from Moderate to Unhealthy. Air quality will be better further from the Cascades.

1 comment:

  1. Thank you for the info and answers to questions. I appreciate the frequent updates and easy to understand terminology.


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