MESOSCALE DISCUSSION 0959
   NWS STORM PREDICTION CENTER NORMAN OK
   0805 PM CDT TUE MAY 20 2008
   
   AREAS AFFECTED...CNTRL THROUGH S CNTRL GA
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 210105Z - 210200Z
   
   STORMS WILL DEVELOP SWD THROUGH CNTRL AND EVENTUALLY S CNTRL GA THIS
   EVENING. THREAT MAY PERSIST FOR ISOLATED DAMAGING WIND AND LARGE
   HAIL NEXT FEW HOURS AND ANOTHER WW SOUTH OF WW 328 MIGHT BE NEEDED.
   HOWEVER...THERE ARE SOME INDICATIONS THAT OVERALL TREND MAY BE FOR
   STORMS TO BEGIN A GRADUAL DECREASE. GIVEN POTENTIAL LIMITING
   FACTORS...THE DECISION TO REPLACE WW 328 WILL ULTIMATELY DEPEND ON
   CONVECTIVE TRENDS DURING THE NEXT 30 MINUTES OR SO.
   
   PRE-FRONTAL LINE OF CONVECTION WITH SOME BOWING SEGMENTS CONTINUE
   ACROSS CNTRL GA WWD THROUGH E CNTRL AL. THE ATMOSPHERE REMAINS
   MODERATELY UNSTABLE AND WEAKLY CAPPED ACROSS THE REMAINDER OF CNTRL
   AND S CNTRL GA DOWNSTREAM FROM THIS ACTIVITY. THE KINEMATIC
   ENVIRONMENT WITH STRONG EFFECTIVE SHEAR WILL REMAIN SUPPORTIVE OF
   EMBEDDED ORGANIZED STORM STRUCTURES IN THE LINE. HOWEVER...ONSET OF
   NOCTURNAL COOLING AND LARGE SCALE SUBSIDENCE IN WAKE OF THE
   SHORTWAVE TROUGH MOVING THROUGH THE ERN CAROLINAS WILL POSE LIMITING
   FACTORS ON THE DURATION AND MAGNITUDE OF REMAINING SEVERE THREAT.
   
   ..DIAL.. 05/21/2008
   
   
   ATTN...WFO...CHS...CAE...FFC...
   
   33008485 32998391 33238294 33568227 33028183 32448211
   32048293 32018386 32208452 32658500