MESOSCALE DISCUSSION 1404
   NWS STORM PREDICTION CENTER NORMAN OK
   0314 PM CDT SUN JUN 26 2011
   
   AREAS AFFECTED...NRN GA...WRN SC...WRN NC
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 556...
   
   VALID 262014Z - 262115Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 556
   CONTINUES.
   
   VISIBLE SATELLITE IMAGERY REVEALS A RESIDUAL OUTFLOW BOUNDARY FROM
   EARLIER CONVECTION ARCING FROM THE SRN APPALACHIANS ACROSS NRN GA
   AND INTO NRN AL. THE AIR MASS ALONG AND S/SE OF THIS FEATURE HAS
   BECOME MODERATELY UNSTABLE OWING TO SFC TEMPERATURES HAVING WARMED
   INTO THE LOWER TO MIDDLE 90S AMIDST DEWPOINTS IN THE MIDDLE 60S.
   VIGOROUS CONVECTION WILL CONTINUE TO DEVELOP IN RESPONSE TO
   CONVERGENCE ALONG THE BOUNDARY THAT WILL BE AUGMENTED BY OROGRAPHIC
   INFLUENCES OVER HIGHER TERRAIN...AS HAS BEEN NOTED OVER PORTIONS OF
   NRN GA. WITH WLY LOW-LEVEL FLOW VERTICALLY VEERING TO NLY BY 3.5 KM
   AGL PER ATLANTA VWP...ASSOCIATED WITH SPEEDS OF 15 KT OR LESS WITHIN
   THE LOW-TO-MID LEVELS...PULSE CONVECTION WILL OCCUR AND GENERALLY
   MOVE EWD/ESEWD...WITH AN ENHANCED FOCUS FOR CONVECTION OCCURRING
   NEAR THE RESIDUAL OUTFLOW BOUNDARY. DCAPE VALUES OF 1000 TO 1300
   J/KG COULD SUPPORT DMGG WIND GUSTS ASSOCIATED WITH WET MICROBURSTS.
   
   MEANWHILE...THE ERN FLANK OF A BOWING SQUALL LINE ARCING FROM SRN
   PORTIONS OF MIDDLE TN ACROSS NRN AL INTO FAR NERN MS WILL LIKELY
   ENTER WRN PORTIONS OF WW 556 AFTER 2100Z. THIS FEATURE WILL PROVIDE
   A GREATER THREAT FOR DMGG WIND GUSTS AS IT POSSESSES A MORE
   ORGANIZED/LARGER COLD POOL PER RECENT SFC OBSERVATIONS -- I.E.
   PRESSURE RISES UP TO 3 MB IN 2 HOURS ACROSS NRN AL. THIS WILL
   PARTICULARLY BE THE CASE ALONG AND SOUTH OF THE RESIDUAL OUTFLOW
   BOUNDARY ACROSS NRN GA...WHERE THE GREATEST POTENTIAL PARCEL
   BUOYANCY EXISTS.
   
   ..COHEN.. 06/26/2011
   
   
   ATTN...WFO...CAE...GSP...FFC...
   
   LAT...LON   33448409 33418477 33638524 34288536 34868507 34918439
               34938369 34998261 35578150 35598071 35178051 34398055
               33938106 33598204 33568309 33448409