Friday, August 23, 2019

Storms And Bit Of Rain Yesterday


View of Catalinas from campus yesterday at 6:00 pm MST.


There were thunderstorms in the metro area late yesterday afternoon - lightning and thunder here around 9:00 pm. Most storms however stayed from west to south of metro - plot of detected CG flashes above for 24-hours ending at 1:00 am this early morning from Atmo and Vaisala.

ALERT network rain measurements for 24-hours ending at 8:00 am this morning are below - top is north portion of network and second below is south part. Rain reports came mostly from south and west portions of network. Here at house we had thunder but only a Trace of rain - same for airport and DM AFB. There were only three reports of more than half an inch, but site at Arivaca had 1.61".




At 500 mb the large anticyclone continues to dominate the Southwest. However, there appear to be several embedded circulations, including a weak, inverted trough from Big Bend country west and southward to south end of GoC. Temperatures have cooled to around -8C from New Mexico across our area and northwestern Mexico.

Morning upper-air plot for TWC (below) continues to show light and variable winds below 300 mb - so no distinct steering flow and storms this afternoon will be slow moving. CAPE is present, although amounts are not very large - PW bit less than 1.50".

The 12 UTC WRF-RR forecast of composite radar echoes from Atmo (bottom valid at 6pm this evening) does indicate heavy storms in parts of the metro area. 



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