MESOSCALE DISCUSSION 0878
   NWS STORM PREDICTION CENTER NORMAN OK
   0838 AM CDT WED MAY 27 2009
   
   AREAS AFFECTED...SOUTH CENTRAL TX
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 271338Z - 271515Z
   
   ...SEVERE THREAT IS INCREASING ACROSS MUCH OF SOUTH CENTRAL TX...
   
   EXPANDING THUNDERSTORM CLUSTERS WILL SOON MERGE INTO A LARGER MCS 
   OVER SCNTRL TX AS BOUNDARY LAYER WARMS WITHIN WEAK WARM ADVECTION
   REGIME.  AIRMASS IS QUITE BUOYANT SOUTH OF THIS ACTIVITY WITH MLCAPE
   VALUES ON THE ORDER OF 3000 J/KG.  12Z SOUNDINGS FROM CRP...BRO AND
   EVEN DRT ALL SUPPORT A WEAKER THAN NORMAL CAP WITH 900MB BASED
   PARCELS APPARENTLY UNINHIBITED.  GIVEN THE HIGH PRECIPITABLE WATER
   AND ADEQUATE DEEP LAYER SHEAR IT APPEARS THE MCS WILL SLOWLY
   PROPAGATE SEWD WITH A THREAT FOR HAIL AND GUSTY WINDS.  WILL
   CONTINUE MONITORING FOR POSSIBLE WW.
   
   ..DARROW.. 05/27/2009
   
   
   ATTN...WFO...HGX...CRP...EWX...
   
   LAT...LON   29319726 28499479 27329584 28009813 28299990 29069998
               29319726