Another round of showers came through the metro are last night around 1 to 2 am accompanied
by gusty north to northwest winds. These were associated with the third 500 mb S/W, mentioned in earlier posts, that's swinging across the borderlands and being sucked into the large cutoff over the north-central US. Images above show the Catalinas at sunrise with low snow levels and stratus fractus hanging on the foothills. Bottom plots show the time series of T and Td and pressure at atmo sci building on campus. Very impressive squall signatures for a bit past midnight - wind on roof there was about 45 mph.
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Rain here at house was 0.17" and it appears that about 70% of the ALERT gauge sites in eastern Pima County had precipitation over night. Amounts generally ranged from 0.04" to 0.20" with a bit more up in the mountains. Coverage and amounts again increased toward the northern portions of the network. Low temp here at house this morning was 30F.
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Tucson NWS radar came back on line early yesterday afternoon - its return to action was much awaited. Radar loop during the early morning hours shows two distinct echo areas of showers, with some small areas of 35 to 40 dBZ, across the metro area. The TUS ASOS remains dysfunctional.
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