Wednesday, May 11, 2016

2330 UTC: SJT Severe Convection

The storms really got rockin' in SJT forecast area.  The cell in the northern portion of the forecast area developed a hook echo. At 2330 UTC a distinct jump occurred in the lightning data to +3 sigma.  Also, clouds tops continued to rapidly cool.


The hook echo was well-defined at 2333 and it was decided to issue a TOR (see below)


The SRM and Velocity data were very impressive from the KDYX radar. The cursor highlights close to 75 kts on the edge of the old SVR polygon below.


The satellite signatures continued to be impressive in the TOR box (-73C pixel), but new cells began to form further south, and additional SVR's were issued based on the PROB Severe values shooting up to 90-99%, and the overshooting tops in the satellite and IR data (see the 4-panel below).


Overall, it was a great close to a slow starting day.

-Yodamaster777






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