MESOSCALE DISCUSSION 1439
   NWS STORM PREDICTION CENTER NORMAN OK
   0609 PM CDT TUE JUN 28 2011
   
   AREAS AFFECTED...SERN OK...NERN TX...SWRN AR...NWRN LA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 571...572...
   
   VALID 282309Z - 290045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   571...572...CONTINUES.
   
   SEVERE THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG THE INTERSECTION
   OF A RESIDUAL OUTFLOW BOUNDARY FROM EARLIER CONVECTION AND A SFC
   FRONTAL BOUNDARY MAINLY ACROSS SERN OK INTO NERN TX. BEHIND THE
   OUTFLOW BOUNDARY...SOME ELEVATED STORMS WILL BE POSSIBLE ACROSS
   PARTS OF SRN AR INTO NWRN LA. THESE STORMS MAY BRIEFLY PULSE AND
   BECOME STRONG BUT LIKELY WILL NOT BE SEVERE GIVEN THE AIR MASS HAS
   BECOME LESS SUPPORTIVE FOR SEVERE DEEP CONVECTION WITH TEMPERATURES
   IN THE 70S AND LACKLUSTER MLCAPE LESS THAN 1500 J/KG.
   
   MUCH OF WW 571 WILL LIKELY BE ALLOWED TO EXPIRE AT 00Z...ESPECIALLY
   THOSE PORTIONS OVER AR AND LA.  HOWEVER...A LOCAL EXTENSION IN SPACE
   AND TIME MAY BE NEEDED OVER NERN TX GIVEN CURRENT STRENGTH AND
   MOTION OF THE STORM MOVING OUT OF MCCURTAIN COUNTY OK INTO RIVER
   COUNTY TX. GIVEN STORM MOTION TO THE S/SW...THERE MAY BE A NEED FOR
   COUNTIES TO BE ADDED TO WW 572 AT SOME POINT AS WELL THIS EVENING.
   
   ..LEITMAN.. 06/28/2011
   
   
   ATTN...WFO...LZK...SHV...TSA...FWD...OUN...
   
   LAT...LON   34539724 34979615 34429432 33089213 32369266 32589528
               33389743 34539724