MESOSCALE DISCUSSION 0676
   NWS STORM PREDICTION CENTER NORMAN OK
   0649 PM CDT SAT MAY 02 2009
   
   AREAS AFFECTED...NCNTRL-NERN TX
   
   CONCERNING...HEAVY RAINFALL 
   
   VALID 022349Z - 030115Z
   
   IN ADDITION TO THE LARGE HAIL THREAT...VERY HEAVY RAINFALL WILL
   TRAIN ACROSS A 40 MILE CORRIDOR FROM DALLAS NEWD TO KTXK.  RATES
   COULD EXCEED 2-3 IN/HR.
   
   TRAILING OUTFLOW BOUNDARY EMANATING FROM THE BOW ECHO MOVING ACROSS
   SRN AR HAS SETTLED INTO NERN TX...ROUGHLY ALONG I-20 FROM DALLAS TO
   NW OF KSHV.  RECENTLY...ANOTHER BATCH OF MAINLY ELEVATED TSTMS HAS
   DEVELOPED AND CAUSED FLASH FLOODING IN THE DALLAS METROPLEX.  THESE
   STORMS...AND ADDITIONAL UPDRAFTS...WILL LIKELY MERGE ALONG/N OF THE
   OUTFLOW BOUNDARY IN THE AFOREMENTIONED CORRIDOR THROUGH 02Z. 
   PROGGED SSW H85 JET OF 30-35 KTS ORIENTED NORMAL TO THE BOUNDARY
   WILL ADVECT 1.5+ INCH PWATS INTO THE SRN PART OF THE DEVELOPING
   MCS...RESULTING IN STRONG MOISTURE TRANSPORT AND HIGH RAINFALL
   EFFICIENCIES FOR A FEW HOURS AS THE STORMS TRAIN ENEWD.
   
   ..RACY.. 05/02/2009
   
   
   ATTN...WFO...SHV...FWD...
   
   LAT...LON   32879678 33319585 33449422 32759436 32549677 32879678