MESOSCALE DISCUSSION 0289
   NWS STORM PREDICTION CENTER NORMAN OK
   0141 AM CDT WED MAR 20 2013
   
   AREAS AFFECTED...CENTRAL TX/HILL COUNTRY TO UPPER TX COAST
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 200641Z - 200815Z
   
   PROBABILITY OF WATCH ISSUANCE...20 PERCENT
   
   SUMMARY...LOCALLY EXTENDED SEVERE TSTM WATCH 56 CONTINUES UNTIL 07Z
   FOR PORTIONS OF CENTRAL TX...WITH SEVERE HAIL THE PRIMARY RISK...BUT
   ON AN INCREASINGLY ISOLATED/MARGINAL BASIS. SOME SEVERE HAIL THREAT
   MAY PERSIST TO THE EAST-SOUTHEASTWARD OF WW 56 BEYOND 07Z...PERHAPS
   TOWARD THE UPPER TX COAST INCLUDING AREAS NEAR/WEST OF THE HOUSTON
   METRO BY AROUND 0730-08Z.
   
   DISCUSSION...STRONG/SEVERE TSTMS CONTINUE TO PERSIST/REDEVELOP
   WITHIN A SLIGHTLY ABOVE-SURFACE PORTION OF A ROUGHLY WEST-EAST
   ORIENTED COLD FRONT/BAROCLINIC ZONE ACROSS THE REGION. PRIMARY
   SHORT-TERM FOCUS IS ON AN ELEVATED SUPERCELL IN NORTHERN AUSTIN
   COUNTY TX ABOUT 25 MILES NORTH OF I-10 AS OF 0620Z. THIS STORM MAY
   WEAKEN OVER THE NEXT HOUR AS IT ENCOUNTERS INCREASING INHIBITION
   ALOFT AS PER THE 00Z OBSERVED SOUNDING FROM CORPUS CHRISTI. BUT
   SHOULD ITS INTENSITY BE MAINTAINED...A SEVERE HAIL THREAT COULD
   PERSIST INTO FORT BEND/HARRIS COUNTIES POTENTIALLY INCLUDING
   PORTIONS OF THE HOUSTON METRO AREA OR POINTS WEST. FARTHER
   NORTHWEST...OTHER ELEVATED TSTMS MAY CONTINUE TO REDEVELOP/MOVE
   SOUTHEASTWARD OVER CENTRAL TX/HILL COUNTRY VICINITY
   OVERNIGHT...ALTHOUGH THE INCREASINGLY ELEVATED NATURE/DIMINISHING
   UNSTABLE INFLOW WOULD SUGGEST THAT SEVERE HAIL POTENTIAL SHOULD
   REMAIN MARGINAL/ISOLATED AT BEST.
   
   ..GUYER/EDWARDS.. 03/20/2013
   
   
   ATTN...WFO...HGX...FWD...EWX...SJT...
   
   LAT...LON   30429884 31079851 30799686 29739497 29039550 29719733
               30069852 30429884