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Mesoscale Discussion 479
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   MESOSCALE DISCUSSION 0479
   NWS STORM PREDICTION CENTER NORMAN OK
   0525 AM CDT MON APR 27 2015

   AREAS AFFECTED...DEEP SOUTH TX

   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

   VALID 271025Z - 271200Z

   PROBABILITY OF WATCH ISSUANCE...40 PERCENT

   SUMMARY...A RELATIVELY ISOLATED SEVERE THUNDERSTORM WILL LIKELY
   CONTINUE TO MOVE EAST-SOUTHEASTWARD TOWARD THE COASTAL PLAIN OF DEEP
   SOUTH TX EARLY THIS MORNING.

   DISCUSSION...A LONE SEVERE THUNDERSTORM/SUPERCELL THAT DEVELOPED
   NEAR THE RIO GRANDE RIVER/LAREDO VICINITY EARLIER HAS TENDED TO
   PERSIST EAST-SOUTHEASTWARD ACROSS DEEP SOUTH TX THIS
   MORNING...GENERALLY NEAR THE HEBBRONVILLE AREA AS OF 1015Z/515AM
   CDT. THIS STORM IS OCCURRING NEAR A SOUTHEASTWARD-SHIFTING FRONT AND
   RELATED FRONTAL WAVE...WITH PROBABLE AID OF AT LEAST
   GLANCING/SUBTROPICAL LARGER-SCALE SUPPORT. THIS STORM MAY PERSIST
   SOUTHEASTWARD TOWARD NEAR-COASTAL AREAS OF DEEP SOUTH TX EARLY THIS
   MORNING...WITH SEVERE HAIL AND A NON-ZERO TORNADO RISK WITHIN A VERY
   MOIST/UNSTABLE AND HIGHLY SHEARED ENVIRONMENT AS PER EARLIER 00Z
   OBSERVED SOUNDING FROM BROWNSVILLE AND LATEST WSR-88D VWP DATA
   /45-50 KT SOUTHERLY WINDS IN LOWEST 1 KM AGL/.

   ..GUYER/CORFIDI.. 04/27/2015


   ATTN...WFO...CRP...BRO...

   LAT...LON   27139884 27549840 27289690 26519746 27139884 

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Page last modified: April 27, 2015
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