MESOSCALE DISCUSSION 0729
   NWS STORM PREDICTION CENTER NORMAN OK
   0722 AM CDT WED MAY 06 2009
   
   AREAS AFFECTED...PORTIONS NERN LA...MS...WRN/CENTRAL/NRN AL...SRN
   MIDDLE TN...NWRN GA.
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 251...253...
   
   VALID 061222Z - 061345Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   251...253...CONTINUES.
   
   NEW WW OR LOCAL EXTENSION OF EXISTING WWS MAY BE REQUIRED FOR
   PORTIONS MS/AL SE OF ONGOING WW AREAS...GIVEN POTENTIAL FOR MCS WITH
   DAMAGING WINDS TO MOVE SEWD INTO COUNTIES NOT PRESENTLY COVERED BY
   EITHER...WITHIN NEXT 1-2 HOURS.  NERN PORTION OF THIS COMPLEX WILL
   CONTINUE TO MOVE ESEWD OVER REMAINING NRN PORTIONS WW 251.
   
   ACTIVITY CONTINUES TO FORWARD-PROPAGATE INTO VERY MOIST AND WEAKLY
   CAPPED BOUNDARY LAYER AIR THAT IS FCST TO BECOME MORE UNSTABLE
   DURING NEXT FEW HOURS AS INSOLATION BEGINS TO WARM SFC PARCELS. 
   MLCAPES 1000-2000 J/KG SHOULD BE COMMON OVER PRECONVECTIVE AIR MASS
   IN MS/AL.  MEANWHILE CAPPING EVIDENT IN 12Z JAN RAOB SHOULD BE
   ERODED BY HEATING...THEN REMOVED BY FORCE OF ASCENT ALONG LEADING
   EDGE OF SQUALL LINE.  EFFECTIVE SHEAR MOSTLY IN 40-50 KT RANGE WILL
   CONTINUE...WITH MEAN WIND VECTOR ALIGNED DIAGONALLY TO CONVECTIVE
   BAND.  MAIN THREAT WILL CONTINUE TO BE DAMAGING GUSTS...ESPECIALLY
   ACCOMPANYING LEWP/BOW FEATURES.  ISOLATED/MRGL SVR HAIL AND BRIEF
   QLCS-TYPE TORNADIC SPINUPS ALSO ARE POSSIBLE...BUT FOR OVERALL
   IMPACT...SECONDARY TO WIND THREAT.
   
   ..EDWARDS.. 05/06/2009
   
   
   ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MOB...MEG...JAN...
   LZK...
   
   LAT...LON   33669225 33089102 33028991 33348917 34308795 35348721
               35098571 34308496 33598526 32968609 32258740 32018830
               31828994 32049134 32269160 33669225