MESOSCALE DISCUSSION 0976
   NWS STORM PREDICTION CENTER NORMAN OK
   0400 PM CDT SUN JUN 07 2009
   
   AREAS AFFECTED...PORTIONS OF W-CNTRL/SWRN TX
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 072100Z - 072200Z
   
   ISOLATED TSTMS FORMING ACROSS THE HIGHER TERRAIN OF SWRN TX WILL
   POSE AT LEAST A SHORT-TERM DURATION SEVERE HAIL/WIND THREAT.
   UNCERTAINTY OVER LONGEVITY AND POTENTIAL COVERAGE OF CONVECTION AS
   IT ATTEMPTS TO EVOLVE E/NEWD INTO W-CNTRL TX. OBSERVATIONAL TRENDS
   WILL CONTINUE TO BE MONITORED FOR A POSSIBLE WW.
   
   AS OF 2055Z...RADAR IMAGERY DEPICTED AN ISOLATED SUPERCELL AROUND 40
   E FST...WITH A SPLITTING CELL EVOLVING NWD. INTERPOLATED SURFACE
   OBSERVATIONS SUGGEST AIR MASS IS DEEPLY MIXED ALONG DRYLINE/TROUGH
   AXIS WITH TEMPERATURES IN THE MIDDLE 90S AND DEW POINTS IN THE
   MIDDLE 50S. GIVEN THE STEEPNESS OF LAPSE RATES COMBINED WITH NEAR 40
   KT EFFECTIVE SHEAR...SEVERE HAIL AND WINDS WILL BE THE PRIMARY
   THREATS. OPERATIONAL AND HI-RES MODEL GUIDANCE SUGGEST OVERALL
   CONVECTIVE COVERAGE WILL BE SUBSTANTIALLY LESS THAN IN PREVIOUS
   DAYS. WITH MODEST CONVERGENCE ALONG THE DRY LINE AND APPARENT LACK
   OF LARGER-SCALE FORCED ASCENT...UNCERTAINTY REMAINS HIGH REGARDING
   OVERALL COVERAGE AND LONGEVITY OF CONVECTION.
   
   ..GRAMS.. 06/07/2009
   
   
   ATTN...WFO...EWX...SJT...LUB...MAF...
   
   LAT...LON   31000019 29020070 29750142 29760265 30750236 32090159
               32850117 33280090 33390037 33349990 32709956 31869970
               31000019