It is a mild morning in the Tucson area with cloud cover and easterly winds that blew through the night - even here at house. So it is the first morning here of 2015 that has not had lows in the 20s or colder - quite nice for a change.
This morning there are sprinkles and some heavier showers across much of southeastern Arizona. Graphic above is composite radar echoes at 6:30 am MST from NWS TUS. heavier showers are currently off to south and east of the metro area. Reflectivities are high in some showers but tops are fairly low, and there seem to have been no detected CG lightning flashes up to this time.
The 12 UTC morning sounding from TWC (the NWS Office on the Univ. of Arizona campus) is shown below. The value of PW has climbed to nearly an inch, even though atmosphere is relatively dry below 700 mb. So, showers are based above the mountain tops and precipitation will be more significant at higher elevations (looks like there has been 0.04" out at the NWS radar site in the Empire Mountains). The early WRF-NAM forecasts the high RH to remain mostly above 700 mb through the day. So an unsettled day on tap with some periods of showers across the region but little in the way of accumulations.
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