Image shows storm and downburst on west flanks of Catalina Mountains at 6:30 pm MST yesterday afternoon. There were quite a few storms over the metro Tucson area and this one back-built to south merging with other cells. Three distinct rain periods at house produced 0.50" of rain - the most rain in a day at house since the 4th of July.
There was measured rainfall at 43 of the 93 gauges in the ALERT network. There were six gauges that recorded 0.50" or more and the max amount was 0.91" - not bad for such a hot and dry boundary layer. The airport observing station recorded dust, a gust to 44 mph but only a Trace of rain. Nogales had winds to 35 mph; Davis Monthan AFB had gusts to 33 mph; and the rooftop anemometer at Atmo hit 60 mph.
Here in the north part of town the lightning was was quite wicked during the onset of the storms.
Unfortunately, the Nonsoon continues up in Phoenix region.
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