Sunday, August 27, 2017

Increased Storm Coverage Yesterday


Photogenic storms at sunset last evening.



Tucson sounding from 00 UTC (above) indicates slight CAPE and actual storm activity was considerably more than I expected - WRF-GFS at 12 UTC was much better than 12 UTC WRF-RRx. Moisture remained at around 1.25 inches, rather than dropping as RRx model predicted.

Detected CGs (below) from Atmo and Vaisala show 24-hours ending at 1:00 am MST this morning.

Alert data (second below) shows rainfall for 24-hours ending at 7:00 am this morning. A decent event for eat half of network. We had thunder twice here (along with gusty outflows of 30 to 40 mph) - no rain with midafternoon storm, but one after dark produced 0.14". Airport had only 0.04" but nearby DM had 0.46". I think the multiple outflows and early afternoon moisture recycling from early storms played a role in the evening events.




The 500 mb analysis for 12 UTC this morning (above) shows that TS Harvey is trapped between anticyclones over the Great Basin and the GoM. Rainfall amounts have reached over 20 inches in the general Houston area with very severe flooding under way.

Our morning TWC sounding (below) had some problems but PW has increased relative to yesterday but little CAPE indicated again. Models forecast drying from east during day and no storms in our area this afternoon. 


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