MESOSCALE DISCUSSION 1336
   NWS STORM PREDICTION CENTER NORMAN OK
   0714 PM CDT WED JUN 11 2003
   
   AREAS AFFECTED...ERN AR AND NRN MS
   
   CONCERNING...HEAVY RAINFALL 
   
   VALID 120014Z - 120215Z
   
   LOCALLY HEAVY RAINFALL...WITH RATES TO 2.5"/HR...IS EXPECTED IN
   ASSOCIATION WITH CONVECTIVE STORMS EXTENDING FROM CENTRAL AR EWD
   ACROSS NRN MS THROUGH 12/06Z. 
   
   A QUASI-STATIONARY OUTFLOW BOUNDARY HAS BECOME ESTABLISHED IN AN E-W
   DIRECTION FROM NEAR PINE BLUFF AR TO COLUMBUS MS. SLY TO SWLY
   LOW-LEVEL FLOW IMPINGING ON THIS BOUNDARY FROM THE SOUTH IS
   RESULTING IN CONTINUED WIDESPREAD THUNDERSTORM DEVELOPMENT...WITH
   STORM MOTIONS GENERALLY EWD AT 20-25 KT ALONG THE BOUNDARY.
   ADDITIONALLY...BACK-BUILDING NATURE OF THE CONVECTIVE LINE INTO
   CENTRAL AR WILL PROLONG HEAVY RAIN THREAT FOR SEVERAL HOURS ACROSS
   ERN AR. WITH SURFACE DEWPOINTS IN THE MIDDLE 70S AND PW VALUES
   AROUND 1.8" JUST SOUTH OF THE BOUNDARY...TRAINING OF CONVECTIVE
   CORES ACROSS THE DISCUSSION AREA THROUGH EARLY TONIGHT HAS THE
   POTENTIAL TO PRODUCE RAINFALL RATES OF 2-2.5 IN/HR.
   
   ..BANACOS.. 06/12/2003
   
   
   ATTN...WFO...MEG...JAN...LZK...
   
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