MESOSCALE DISCUSSION 0841
   NWS STORM PREDICTION CENTER NORMAN OK
   0542 PM CDT SAT MAY 21 2011
   
   AREAS AFFECTED...CENTRAL TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 316...
   
   VALID 212242Z - 220045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 316
   CONTINUES.
   
   LATEST VISIBLE IMAGERY SHOWS A WWD RETREAT OF THE DRYLINE ACROSS THE
   EDWARDS PLATEAU REGION OF TX...WITH A SLOWER WWD MOVE FARTHER N INTO
   N CENTRAL TX/SRN OK.  CLUSTER OF SUPERCELLS ACROSS
   BURNET/LAMPASAS/CORYELL COUNTIES REMAINS CAPABLE OF PRODUCING LARGE
   HAIL AND DAMAGING GUSTS -- AND POSSIBLY A BRIEF TORNADO. 
   MEANWHILE...NEW CELLS ARE DEVELOPING INVOF THE RETREATING DRYLINE
   JUST W OF THE ONGOING STORMS...WITH SOME SEVERE THREAT STILL
   APPARENT ACROSS THIS AREA/AHEAD OF THE DRYLINE.
   
   EXPECT SEVERE THREAT TO CONTINUE FOR THE NEXT SEVERAL HOURS...AS
   MODERATE INSTABILITY COMBINED WITH FAVORABLY VEERING/INCREASING FLOW
   WITH HEIGHT SUPPORT SUPERCELL ORGANIZATION.
   
   N OF THE WATCH...ISOLATED/DEEPENING CU TOWERS ARE APPARENT ACROSS N
   TX AND SRN OK INVOF THE MORE SLOWLY RETREATING DRYLINE.  WITH
   BACKGROUND THERMODYNAMIC AND KINEMATIC ENVIRONMENT JUST AS FAVORABLE
   FOR SUPERCELLS AS AREAS FARTHER S...WE WILL CONTINUE TO MONITOR THIS
   REGION -- THOUGH ATTM WE REMAIN UNCERTAIN WITH RESPECT TO THE NEED
   FOR A NEW WW.
   
   ..GOSS.. 05/21/2011
   
   
   ATTN...WFO...FWD...OUN...EWX...SJT...
   
   LAT...LON   29810006 30249995 31489889 32539808 33309794 34679780
               34799691 34369609 32489651 31289704 29829792 29810006