Thunderstorms both in the evening yesterday and again after 4:00 am MST this morning. Above is a damp and dreary view of the Catalinas from campus at 7:14 am and below is the 7:00 am NWS TUS composite radar graphic. The morning storms are now weakening overhead and and north of the Catalinas.
The summer thunderstorm season, for many parts of the state, came along after mid-September - certainly true here at the house.
Total rainfalls this morning are again split between two separate events - for example the airport had 0.17" in the evening and added 0.48" after 4:00 am this morning. Here at the house I estimate we had 0.20" last evening and added 0.50" this morning for a total of 0.70" at 6:00 am - has been raining some since then as the storms weaken. Across the ALERT for 24-hours ending at 6:45 am MST there was once again 100% coverage, with numerous sites having more than half an inch. Seven stations, mostly on north side of Catalinas, had more than an inch (Catalinas sector of the network shown below).
The CG flash data illustrate what a substantial thunderstorm event has occurred during the past 24-hours or so. Above plot from Atmo shows detected CG flashes for the 24-hours ending at 1330 UTC this morning - note the intense storm and flash activity over the northern GoC, which is fairly unusual. Below are two CG flash density maps from weather.graphics. The top one is for the 12-hours ending at 5:00 pm MST yesterday afternoon - only a bit of storm activity in eastern Pima County during the afternoon. Second below is for the 6-hours ending at 6:30 am this morning - with the thunderstorm activity focused over eastern Pima County, the northern GoC, and also continuing in New Mexico. The flash graphics are all based on CG data from Vaisala.
The flow at 500 mb splits over southwestern Canada (analysis below is for 12 UTC this morning from NCAR RAL) with our closed low in the southern stream, continuing with fairly cold 500 mb temperatures. The low will be passing overhead today with some cold-core showers and thunderstorms, before we begin a drying out for the weekend.
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