As the fashions have been signaling for days, air high quality over western Oregon and Washington has improved dramatically over the previous 24 h, with a lot of the area having fun with comparatively clear air (inexperienced colours on the map under). Clean air is surging over the Cascades and may quickly displace the smoky air over the NW facet of WA and northern Idaho.
As proven by the plot at Seattle, the speedy decline in particulate ranges began Friday night, with plummeting values in a single day as western winds (winds from the west) strengthened.
The enchancment in air high quality is the results of a major change in circulation, with excessive stress to the southwest and modest westerly/northwesterly circulate pushing clear Pacific air into the area. The forecast map for the circulate at roughly 3000 ft legitimate at 5 PM at this time, reveals the story.
There is a few residual smoke on the market (see satellite tv for pc picture from yesterday) that may transfer inland throughout the subsequent few days: however not sufficient to push us into unhealthy ranges. The smoke is that hazy space over the SW facet of the picture.
The disturbance that led the transition to our clear air introduced the primary actual rain in a very long time to our area (see 24h totals ending eight AM Saturday under), with various areas getting 1 / 4 to a half inch. We acutely wanted the precipitation.
One situation of concern is that there have been various thunderstorms embedded within the showers, with copious lightning over the Cascades and western Oregon. Lightning that might provoke new fires.
The newest HRRR-SMOKE forecasts (under) mission enhancing circumstances at 2 PM at this time, with critical smoke restricted to NE Washington, Montana, and California.
By Sunday at four PM, even Idaho and Montana are clear. But the remaining fires in each Oregon and California proceed to supply critical smoke for these downwind.
For these of us in western Washington, we’re in all probability achieved with critical smoke for the season, however in California the top is just not in sight.______________________________________________________
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