MESOSCALE DISCUSSION 1718
   NWS STORM PREDICTION CENTER NORMAN OK
   0145 AM CDT THU JUL 30 2009
   
   AREAS AFFECTED...SRN OK...NRN...CNTRL/W CNTRL TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 637...638...
   
   VALID 300645Z - 300815Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   637...638...CONTINUES.
   
   AN ADDITIONAL WW MAY NOT BE NEEDED AT THE 08Z EXPIRATION OF WW 637
   ...PORTIONS OF WW 637 ALONG THE RED RIVER MAY NEED TO BE EXTENDED
   THROUGH 09-10Z...HOWEVER.
   
   A WARMER/UNSATURATED PRE-FRONTAL LOWER/MID TROPOSPHERIC ENVIRONMENT
   ...SUPPORTIVE OF STRONG CONVECTIVELY GENERATED SURFACE COLD POOL
   DEVELOPMENT...IS MOSTLY CONFINED TO AREAS ALONG AND SOUTH OF THE RED
   RIVER.  AND...THIS IS WHERE ACCELERATION OF MERGING COLD POOLS
   ASSOCIATED WITH ONGOING STORM CLUSTERS IS MOST PRONOUNCED...AIDED BY
   A MODEST SOUTHERLY LOW-LEVEL JET ACROSS SOUTHWEST THROUGH PARTS OF
   NORTHWEST TEXAS.  AS THE LOW-LEVEL JET GRADUALLY VEERS TO A MORE
   SOUTHWESTERLY COMPONENT ACROSS WEST CENTRAL/NORTH CENTRAL TEXAS 
   BETWEEN NOW AND 09-10Z...DAMAGING WIND POTENTIAL IS EXPECTED TO
   GRADUALLY DIMINISH ACROSS SOUTH CENTRAL/SOUTHEASTERN OKLAHOMA.
   
   ..KERR.. 07/30/2009
   
   
   ATTN...WFO...FWD...OUN...SJT...MAF...
   
   LAT...LON   32160111 32400030 32749987 33029972 33319878 33489816
               33979776 34149768 34299681 34269610 33779590 33089576
               32369615 31899813 31459954 31330092 31520193 31850198
               31990166 32160111