MESOSCALE DISCUSSION 0595
   NWS STORM PREDICTION CENTER NORMAN OK
   0149 AM CDT MON APR 27 2009
   
   AREAS AFFECTED...PERMIAN BASIN SEWD ACROSS THE EDWARDS PLATEAU
   
   CONCERNING...TORNADO WATCH 196...
   
   VALID 270649Z - 270815Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 196 CONTINUES.
   
   THE THREAT FOR MAINLY HAIL AND LOCALLY STRONG WIND GUSTS WILL
   CONTINUE WITH ONGOING STORMS ACROSS WW AREA.
   
   LONG-LIVED SUPERCELL CONTINUES TO SLOWLY WEAKEN AS OF 0630Z OVER
   GILLESPIE COUNTY...PRESUMABLY AS STRONGER...BACKGROUND FORCING FOR
   ASCENT LIFTS NEWD AWAY FROM REGION.  THIS STORM MAY CONTINUE FOR THE
   NEXT HOUR OR TWO OWING TO THE MOIST/UNSTABLE...AND STILL ONLY WEAKLY
   CAPPED BOUNDARY LAYER.  AND...SOME HAIL AND/OR LOCALLY STRONG WIND
   GUSTS WILL REMAIN POSSIBLE WITH IT APPROACHES THE AUS AREA BETWEEN
   0800-0830Z.
   
   MEANWHILE...CLUSTERS OF BACKBUILDING AND LIKELY ELEVATED STORMS HAVE
   BEEN OBSERVED FROM MIDLAND COUNTY SEWD TO TOM GREEN COUNTY.  THIS
   ACTIVITY APPEARS TO BE DRIVEN BY A ZONE OF ENHANCED ASCENT ALONG
   30-40 KT LLJ ATOP RESIDUAL OUTFLOW BOUNDARY FROM EARLIER SUPERCELL
   COMPLEX.  THE COMBINATION OF STEEP MIDLEVEL LAPSE RATES...MODERATE
   CONVECTIVE INSTABILITY AND SUFFICIENT CLOUD BEARING SHEAR SHOULD
   SUSTAIN ONGOING STORMS WITH A CONTINUED THREAT FOR SOME HAIL IN
   ADDITION TO LOCALLY EXCESSIVE RAINFALL.
   
   ..MEAD.. 04/27/2009
   
   
   ATTN...WFO...FWD...EWX...SJT...MAF...
   
   LAT...LON   30210158 30730196 31780194 32390152 32830086 32840012
               32569939 31609870 30649855 30219877 29800030 30210158