Thursday, May 26, 2011

Overnight Fropa

By nighttime standards, we had a pretty good frontal passage (fropa) last night.  At KSLC, note the abrupt drop in temperature and increase in wind speed (with a gust to 49 mph) at about 0930 UTC (3:30 am MST).

The radar at this time showed an abrupt transition in radar reflectivity with considerable "clear air return" in the post-frontal environment.

It looks to be a bit dusty around the Salt Lake Valley this morning.  Thus, it appears the strong post-frontal winds picked up some dust from Nevada and/or the West Desert and transported it into our area.

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