MESOSCALE DISCUSSION 0494
   NWS STORM PREDICTION CENTER NORMAN OK
   0232 AM CDT FRI APR 17 2009
   
   AREAS AFFECTED...WRN N TX SWD INTO THE EDWARDS PLATEAU REGION
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 158...
   
   VALID 170732Z - 170930Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 158
   CONTINUES.
   
   STRONG/LOCALLY-SEVERE STORMS CONTINUE FROM WRN N TX INTO THE EDWARDS
   PLATEAU REGION OF TX.
   
   LATEST RADAR LOOP REVEALS SEVERAL STRONG TO LOCALLY-SEVERE
   THUNDERSTORMS...THE STRONGEST OF WHICH ARE MOVING ACROSS TOM
   GREEN...SCHLEICHER AND SUTTON COUNTIES.  THIS BOWING CLUSTER OF
   STORMS -- WITH AN EMBEDDED SUPERCELL NOW CROSSING SERN SCHLEICHER
   COUNTY -- WILL REMAIN CAPABLE OF PRODUCING LARGE HAIL...DAMAGING
   WINDS...AND PERHAPS AN ISOLATED TORNADO.  THE GREATER SEVERE
   POTENTIAL WILL PERSIST HERE AND ACROSS AREAS IMMEDIATELY
   EAST...GIVEN CLOSER PROXIMITY TO RICH GULF MOISTURE ADVECTING NWWD
   ACROSS THE LOWER RIO GRANDE VALLEY.  WHILE THE SRN EXTENT OF THE
   CONVECTION SHOULD REMAIN LIMITED BY A FAIRLY STRONG CAP...500 TO
   1000 J/KG MIXED-LAYER CAPE AND FAVORABLE DEEP-LAYER SHEAR WILL
   CONTINUE TO SUPPORT VIGOROUS/SUPERCELL STORMS EWD TOWARD THE HILL
   COUNTRY REGION.
   
   FARTHER N ACROSS ROUGHLY THE NRN HALF OF THE WATCH...THE AIRMASS
   REMAINS LESS UNSTABLE...AND STORMS ARE LIKELY ELEVATED ABOVE A
   SHALLOW/FAIRLY STABLE BOUNDARY LAYER.  WITH STORMS HEADING INTO A
   DRIER LOW-LEVEL AIRMASS...EXPECT CONVECTIVE POTENTIAL TO REMAIN MORE
   LIMITED.
   
   ..GOSS.. 04/17/2009
   
   
   ATTN...WFO...FWD...OUN...EWX...SJT...LUB...
   
   LAT...LON   29020059 29450140 30310167 30600064 31300029 31720063
               33270010 33439861 32439829 29249965 29020059