MESOSCALE DISCUSSION 0274
   NWS STORM PREDICTION CENTER NORMAN OK
   0509 AM CDT MON MAR 12 2007
   
   AREAS AFFECTED...UPPER TX COAST
   
   CONCERNING...TORNADO WATCH 59...
   
   VALID 121009Z - 121145Z
   
   POTENTIAL FOR DAMAGING WINDS AND ISOLATED TORNADOES IS EXPECTED TO
   CONTINUE ACROSS CNTRL AND ERN PORTIONS OF WW AREA THROUGH 12Z.  A
   POTENTIALLY ENHANCED THREAT OF DAMAGING WINDS AND NON-DESCENDING
   TYPE TORNADOES WILL EXIST FROM ERN FORT BEND COUNTY EWD THROUGH
   PORTIONS OF HARRIS AND BRAZORIA COUNTIES THROUGH 11Z.
   
   AS OF 1000Z...RADAR IMAGERY INDICATED A COMPLEX LEWP STRUCTURE TO
   ONGOING MCS WITH SYSTEM BECOMING INCREASINGLY BOWED ACROSS CNTRL
   FORT BEND COUNTY.  THIS PORTION OF MCS HAS ACCELERATED WITHIN THE
   PAST HOUR OR SO WITH OBSERVED MOTION 255/35-40 KT.  BASE VELOCITY
   DATA INDICATE A FAIRLY LARGE CORRIDOR OF 35 + INBOUND VELOCITIES
   OVER FORT BEND COUNTY WITH SOME EMBEDDED 50 KT + PIXELS. 
   MOREOVER...SRM DATA SHOW SMALL...FAIRLY INTENSE COUPLETS ALONG
   LEADING EDGE OF SYSTEM COLD POOL PROPAGATING NNWWD.
   
   AS SUCH...IT APPEARS THE GREATEST THREAT OF LOCALLY DAMAGING WINDS
   WILL EXIST FROM ERN FORT BEND COUNTY EWD THROUGH SRN HARRIS AND NRN
   BRAZORIA COUNTIES THROUGH 11Z.  BRIEF...NON-DESCENDING TYPE
   TORNADOES WILL ALSO REMAIN POSSIBLE IN ASSOCIATION WITH THESE MORE
   INTENSE VELOCITY COUPLETS PROPAGATING ALONG COLD POOL INTERFACE.
   
   ..MEAD.. 03/12/2007
   
   
   ATTN...WFO...LCH...HGX...CRP...EWX...
   
   30609535 30539446 29069407 27999610 28709681 29419669
   30239658 30779580