MESOSCALE DISCUSSION 0940
   NWS STORM PREDICTION CENTER NORMAN OK
   0624 PM CDT THU MAY 15 2008
   
   AREAS AFFECTED...LOWER RIO GRANDE VALLEY
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 152324Z - 160030Z
   
   STRONG TO POTENTIALLY SEVERE STORMS ARE EXPECTED TO APPROACH THE
   INTERNATIONAL BORDER AROUND 00Z WITH AN ATTENDANT THREAT OF LOCALLY
   DAMAGING WINDS AND SOME HAIL.  A WW IS NOT ANTICIPATED ATTM.
   
   SCATTERED DIURNAL TSTMS HAVE DEVELOPED OFF THE SERRANIAS DEL BURRO
   RANGE OF MEXICO WITHIN POST-FRONTAL UPSLOPE FLOW REGIME WITH THE
   MOST INTENSE STORM LOCATED ABOUT 35 S OF DRT AS OF 2315Z.  THIS
   STORM IS EXHIBITING SUPERCELL CHARACTERISTICS AND EXTRAPOLATION OF
   CURRENT MOTION TAKES IT INTO WRN MAVERICK COUNTY AFTER 00Z.  RUC
   OBJECTIVE FIELDS INDICATE THAT THE AIR MASS OVER THE LOWER RIO
   GRANDE VALLEY REMAINS MODERATELY UNSTABLE WITH MLCAPES OF 1000-1500
   J/KG.  HOWEVER...THIS INSTABILITY DIMINISHES WITH EWD EXTENT INTO TX
   OWING DRY ADVECTION IN THE BOUNDARY LAYER.
   
   KINEMATIC ENVIRONMENT SHOULD REMAIN SUPPORTIVE OF UPDRAFT ROTATION
   GIVEN THE LOW-LEVEL ELY WINDS VEERING TO WLY AT 30-40 KT IN THE
   MIDLEVELS.  AS SUCH...THE POTENTIAL FOR LARGE HAIL AND LOCALLY
   DAMAGING WIND GUSTS WILL EXIST WITH THIS STORM SHOULD IT MAINTAIN
   IT/S INTENSITY ACROSS THE RIO GRANDE.  THIS SEVERE THREAT SHOULD
   REMAIN QUITE ISOLATED AND A WW IS NOT ANTICIPATED.
   
   ..MEAD.. 05/15/2008
   
   
   ATTN...WFO...CRP...EWX...
   
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