MESOSCALE DISCUSSION 2156
   NWS STORM PREDICTION CENTER NORMAN OK
   1048 AM CDT THU OCT 29 2009
   
   AREAS AFFECTED...E TX/WRN LA
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 291548Z - 291745Z
   
   STORMS ARE PROGGED TO SLOWLY INCREASE IN INTENSITY OVER THE NEXT FEW
   HOURS ACROSS THIS REGION...WITH WW POSSIBLE BY EARLY AFTERNOON.
   
   LATEST RADAR/VISIBLE IMAGERY AS WELL AS LIGHTNING DATA SHOW A
   SLOW/STEADY INCREASE IN THUNDERSTORM COVERAGE AND INTENSITY OVER THE
   PAST HOUR OR SO...BOTH INVOF THE COLD FRONT MOVING ACROSS CENTRAL TX
   AS WELL AS WITHIN A ZONE OF PRE-FRONTAL WARM ADVECTION EXTENDING AS
   FAR E AS WRN LA.  WHILE HEATING REMAINS LIMITED BY ABUNDANT CLOUD
   COVER...EVEN MODEST HEATING OF THE VERY MOIST /LOW TO MID 70S
   DEWPOINTS/ BOUNDARY LAYER WILL RESULT IN ADDITIONAL DESTABILIZATION
   OF THE PRE-FRONTAL WARM SECTOR.  THIS -- COMBINED WITH WEAK HEIGHT
   FALLS AHEAD OF THE APPROACHING UPPER SYSTEM SHOULD RESULT IN A
   CONTINUED/STEADY INCREASE IN STORMS THROUGH THE AFTERNOON.
   
   ALONG WITH THE THREAT FOR DAMAGING WINDS...SURFACE SELYS ACROSS TX
   INCREASING/VEERING RAPIDLY TO SLY AT 50-PLUS KT AT 1/2 TO 1 KM IS
   YIELDING LOW-LEVEL SHEAR SUPPORTIVE OF ROTATION/ISOLATED TORNADOES. 
   EXPECT SEVERE/TORNADO POTENTIAL TO INCREASE INTO THIS AFTERNOON IN
   CONJUNCTION WITH THE STEADY INCREASE IN STORM
   ORGANIZATION/INTENSITY.
   
   ..GOSS.. 10/29/2009
   
   
   ATTN...WFO...LCH...SHV...HGX...FWD...OUN...EWX...SJT...
   
   LAT...LON   33779704 33829525 33139390 31519206 30629249 30249411
               30009597 30539770 30979856 32399756 33779704