Numerous reports of severe thunderstorms and wind damage from the north Phoenix Valley yesterday evening. Strong storms and outflow from the Rim kicked off storm development. The outflow shows nicely on the 7:40 pm MST radar above (from NCAR - base scan only). Down here there was one large cell moving along Catalina foothills north of here, with weaker cells near airport and along I-10 east.
In Phoenix area, Luke AFB reported gusts to 69 mph with near zero visibility. Graphic below shows the Maricopa County flood district's gauge reports (past 24-hours ending at 7:00 am this morning) with radar estimates overlain from WDT. Note that one gauge with 4.41" was apparently malfunctioning.
Thunderstorms north of Catalinas at 6:33 pm last evening. The plot below shows detected CG flashes for 24-hours ending at 11:00 pm last evening (from Atmo and Vaisala) - storm in north Valley up in Phoenix metro area stands out. In southeast Arizona storms continued to mostly hug mountains, without enough outflow lift to produce serious storms at low elevations - even though east winds gusted over 40 mph at airport. Southern Cochise County was very active also (1.33" at Ft. Huachuca and 1.89 at Pioner Airfield and 1.06" at Douglas). At bottom is Pima County ALERT map for 24-hours ending at 5:00 am this morning. Once again mostly light rainfall across much of metro area. Here at the house we had thunder and outflows, but only 0.02" in gauge this am. Very frustrating July here in the Rillito Bottoms!
This morning there is little CAPE in TWC upper-air data and noticeable drying has occurred below 500 mb. The 06 UTC WRF forecasts have little activity in our area - GFS version has couple small cells in metro area around 6:00 pm, while NAM version has couple of small cells well to south and southwest of metro around 3:00 to 4:00 pm.
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