MESOSCALE DISCUSSION 0275
   NWS STORM PREDICTION CENTER NORMAN OK
   0610 AM CDT MON MAR 12 2007
   
   AREAS AFFECTED...FAR SERN TX INTO SWRN LA
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 121110Z - 121245Z
   
   POTENTIAL FOR ISOLATED DAMAGING WIND GUSTS IS EXPECTED TO INCREASE E
   OF WW 59 AREA BY 12Z.  AN ADDITIONAL WW IS NOT ANTICIPATED ATTM.
   
   AS OF 1100Z...REGIONAL RADAR IMAGERY INDICATED LEADING EDGE OF MCS
   FROM WRN MONTGOMERY SWD THROUGH CNTRL PORTIONS OF HARRIS AND
   BRAZORIA COUNTIES WITH A GENERAL SYSTEM MOTION OF 245/30-35 KT. 
   EXTRAPOLATION OF THIS MOVEMENT PLACES MCS E OF WW 59 BY 12Z. 
   CURRENT SURFACE OBSERVATIONS AND RUC OBJECTIVE FIELDS SUGGEST THAT
   THIS CONVECTION IS MOVING THROUGH PRIMARY INSTABILITY AXIS WHICH HAS
   BEEN DEVELOPING NWD THROUGH THE MIDDLE AND UPPER TX COAST EARLY THIS
   MORNING.
   
   FARTHER TO THE E OVER THE LOWER SABINE VALLEY...SURFACE DEWPOINTS
   HAVE BEEN STEADILY INCREASING INTO THE LOW/MID 60S...SUGGESTING THAT
   SOME AIR MASS DESTABILIZATION IS OCCURRING IN ADVANCE OF MCS.  AS
   SUCH...EXPECT THAT SYSTEM WILL LIKELY CONTINUE EWD THROUGH FAR SERN
   TX AND SWRN LA THIS MORNING.  ISOLATED DAMAGING WIND GUSTS WILL
   REMAIN POSSIBLE...ESPECIALLY WITH ANY EMBEDDED BOWING SEGMENTS. 
   HOWEVER...IT APPEARS THAT MCS WILL GRADUALLY OUTPACE THE DOWNSTREAM
   DESTABILIZATION WITH SYSTEM WEAKENING BY MID MORNING.
   
   ..MEAD.. 03/12/2007
   
   
   ATTN...WFO...LCH...HGX...
   
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