Monday, July 31, 2023

More Nighttime Showers



View looking toward the Catalinas at 4:50 am MST this morning.


Plot of detected CG flashes through 0713 UTC (around midnight) shows some storm activity in eastern Pima County, but with very active  and large area to the west. There may have been a bit of thunder here.

Plot of rain reports from MesoWest (Univ. of Utah - below) through 7:00 am this morning shows light showers west, foothills, and east toward the Rincons. Report of 4.67" near downtown is obviously from a bad gauge. Although TUS, DM and Atmo reported no rain, we had 0.05" around midnight.

Several large MCSs moved westward along the Borderlands. This one at 0915 UTC IR image below) is moving into southern California, where there four reports of severe winds.


The 500 mb inverted trough that was supposed to move by today appears to have weakened dramatically and already passed by our area (above 12 UTC 500 mb chart from NCAR RAP).

The morning sounding (below) from SPC has moistened considerably in lower levels (finally) and has considerable CAPE with southeast steering winds. However, there is a capping layer around 700 mb that will have to be overcome.


Several of the recent WRF runs have really zeroed in on the metro area - as per above 12 UTC WRF-RR forecast of rainfall through midnight. Below is the morning storm graphic posted on the NWS website. The NWS POPs for measurable rain at the airport are 80% today and 60% tonight.

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