Yesterday morning, the 5 AM sounding from the Salt Lake City Airport showed a very strong inversion with temperatures increasing from about –8ºC at the surface to about +4ºC at 775 mb (approximately 2250 m/7500 feet).
Source: University of Wyoming |
Source: University of Wyoming |
Although the cooling aloft weakened the inversion, it didn't break it. It has merely helped ventilate the valley a bit and both hourly and 24-hour average PM2.5 levels are lower today than yesterday. That's good news, but only in a relative sense. We are still fluctuating around levels that are considered unhealthy for sensitive groups.
Source: Utah Division of Air Quality |
I've been looking at the forecasts and their is no Christmas miracle between now and at least January 2nd (there may be hope for at least a temporary reprieve farther out, but it's too soon to say with any confidence). We are, however, a bit downstream of the ridge axis with some weak systems passing just to our north and northeast. If we are fortunate, these systems will stir things up a bit and keep the inversion from getting really ugly. If we are unfortunate, it is going to get worse, much worse.
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