MESOSCALE DISCUSSION 0854
   NWS STORM PREDICTION CENTER NORMAN OK
   0956 PM CDT MON MAY 21 2007
   
   AREAS AFFECTED...SW TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 284...
   
   VALID 220256Z - 220400Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 284
   CONTINUES.
   
   LEADING EDGE OF MCS AT 0245Z EXTENDED FROM JUST SOUTHWEST OF SOA TO
   WEST OF DRT WITH AREA OF STRATIFORM RAIN. SLOW MOVEMENT OF STORMS
   AND COOLING TOPS ON IR IMAGERY SUGGEST THAT HEAVY RAIN IS MOST
   LIKELY THE MAIN CONCERN...ESPECIALLY WITH MERGING CELLS. RECENT
   TRENDS ON LOCAL RADAR SUGGEST GUSTY WINDS ARE
   POSSIBLE...PARTICULARLY ACROSS ERN VAL VERDE CO WHERE BOWING SEGMENT
   IS DEVELOPING. 
   
   A FEW STORMS HAVE FORMED WEST OF MAVERICK COUNTY ACROSS THE MEXICAN
   BORDER...AND MAY POSE A THREAT OF LARGE HAIL/DAMAGING WINDS FOR
   MAVERICK CO WITHIN THE NEXT HOUR OR TWO. MOST INTENSE STORM HAS
   BRIEFLY SHOWN SUPERCELL CHARACTERISTICS WITHIN A FAVORABLE DEEP
   LAYER SHEAR ENVIRONMENT. OTHERWISE MCS IS EXPECTED TO MAINTAIN ITS
   SEWD MOTION WITH HEAVY RAIN.
   
   ..TAYLOR.. 05/22/2007
   
   
   ATTN...WFO...CRP...EWX...SJT...
   
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