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Mesoscale Discussion 339
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   MESOSCALE DISCUSSION 0339
   NWS STORM PREDICTION CENTER NORMAN OK
   0322 PM CDT FRI APR 17 2015

   AREAS AFFECTED...MID/UPPER TEXAS COASTAL PLAIN

   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 

   VALID 172022Z - 172215Z

   PROBABILITY OF WATCH ISSUANCE...95 PERCENT

   SUMMARY...THE RISK FOR SEVERE HAIL AND DAMAGING SURFACE WIND GUSTS
   WILL CONTINUE TO INCREASE WITH AN EVOLVING CONVECTIVE SYSTEM
   OVERSPREADING THE MID/UPPER TEXAS COASTAL PLAIN THROUGH 22-00Z.

   DISCUSSION...A STILL RELATIVELY SMALL...BUT EVOLVING MESOSCALE
   CONVECTIVE SYSTEM IS MAINTAINING INTENSITY...AND A 25-30 KT EAST
   NORTHEAST MOTION AS IT PROGRESS SOUTH AND EAST OF SAN ANTONIO. 
   FURTHER INTENSIFICATION REMAINS PROBABLE IN THE PEAK BOUNDARY LAYER
   INSTABILITY ACROSS THE MID/UPPER TEXAS COASTAL PLAIN.  AS THE
   CONVECTIVELY GENERATED COLD POOL CONTINUES TO STRENGTHEN...AN
   INCREASE IN FORWARD ACCELERATION SEEMS LIKELY TO BE ACCOMPANIED BY A
   GENERAL INCREASE IN DAMAGING SURFACE GUSTS...WHICH COULD IMPACT THE
   HOUSTON METROPOLITAN BY AREA AS EARLY AS 00Z.

   ..KERR/HART.. 04/17/2015


   ATTN...WFO...HGX...CRP...EWX...

   LAT...LON   29189796 29829655 29919577 29539498 28949542 27979701
               27949766 28249832 28719814 29189796 

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