MESOSCALE DISCUSSION 0263
   NWS STORM PREDICTION CENTER NORMAN OK
   0723 PM CST SAT MAR 09 2013
   
   AREAS AFFECTED...PARTS OF THE EDWARDS PLATEAU INTO THE HILL COUNTRY
   OF S CNTRL TEXAS
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 100123Z - 100230Z
   
   PROBABILITY OF WATCH ISSUANCE...80 PERCENT
   
   SUMMARY...A NEW WW PROBABLY WILL BE ISSUED SHORTLY.
   
   DISCUSSION...AN INCREASE IN STORM DEVELOPMENT IS ONGOING ACROSS
   PARTS OF THE EDWARDS PLATEAU INTO THE HILL COUNTRY OF SOUTH CENTRAL
   TEXAS...JUST TO THE SOUTH OF SEVERE THUNDERSTORM WATCH 49.  THIS
   APPEARS AIDED BY FORCING FOR UPWARD VERTICAL MOTION ASSOCIATED WITH
   LOW-LEVEL WARM ADVECTION...BENEATH INCREASINGLY DIVERGENT HIGH LEVEL
   FLOW.  SOME STRENGTHENING OF SOUTHERLY 850 MB FLOW IS FORECAST LATE
   THIS EVENING...WHICH MAY CONTRIBUTE TO A FOCUSED AREA OF STRONGER
   WARM ADVECTION WHICH COULD SUPPORT STORM CONSOLIDATION...AND THE
   EVOLUTION OF A MORE SUBSTANTIVE STORM CLUSTER DURING THE 03-06Z TIME
   FRAME.  ALTHOUGH THE LOSS OF SURFACE HEATING WILL RESULT IN A
   GRADUAL STABILIZATION OF THE BOUNDARY LAYER...MID-LEVEL LAPSE RATES
   REMAIN RELATIVE STEEP ...AND A CONTINUING INFLUX OF LOW-LEVEL
   MOISTURE PROBABLY WILL MAINTAIN SIZABLE CAPE AND VIGOROUS CONVECTIVE
   DEVELOPMENT INTO THE OVERNIGHT HOURS.  IN ADDITION TO THE RISK FOR
   LARGE HAIL...A WINDOW OF OPPORTUNITY APPEARS TO EXIST FOR INCREASING
   DAMAGING WIND POTENTIAL LATE THIS EVENING.
   
   ..KERR/WEISS.. 03/10/2013
   
   
   ATTN...WFO...FWD...EWX...SJT...
   
   LAT...LON   30110027 31179947 31349776 30779726 29639812 29589894
               30110027