Pacific cold front moving across southern Arizona today with bands of heavy, low clouds. View of Catalinas above was at 7 am MST and visible satellite image below was from 8 am. There have been some very light showers in the mountains, with one station in the Catalinas reporting 0.04". Winds yesterday ahead of the front gusted from 40 to 60 mph over much of eastern and northern Arizona.
The 12 UTC morning sounding (above) at Tucson shows increased moisture in low-levels but CAPE is limited to a shallow layer below 650 mb, due to the very strong temperature inversion there. Thus, not much chance of showers except on the mountains. Looks like September will close out very dry for southern Arizona - there was only rainfall here at house on 4 days, with the last one of those days being the 9th.
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