MESOSCALE DISCUSSION 1833
   NWS STORM PREDICTION CENTER NORMAN OK
   0251 PM CDT TUE AUG 21 2007
   
   AREAS AFFECTED...MUCH OF SRN VA/NRN NC AND THE SRN DELMARVA
   PENINSULA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 629...
   
   VALID 211951Z - 212145Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 629
   CONTINUES.
   
   SEVERAL ORGANIZED BANDS OF STG-SVR TSTMS WILL CONTINUE TO PUSH EWD
   THROUGH WW 629 OVER THE NEXT FEW HOURS. SVR THREAT SHOULD BEGIN TO
   EXIST EAST OF WW 629 BY 21Z...AND A NEW WW IS EXPECTED BEFORE THEN.
   
   LATEST RADAR IMAGERY SHOWS SEVERAL ORGANIZED LINES OF TSTMS MOVING
   ACROSS SWRN VA/WRN NC AND FAR ERN TN FROM 25-35 KTS. BASED ON
   EXTRAPOLATION OF RECENT LINE MOTIONS...THE LEADING EDGE OF THE SVR
   THREAT SHOULD MOVE EAST OF WW 629 INTO SCENTRAL VA AROUND 21Z...WITH
   ACTIVITY FURTHER SOUTH IN WRN NC NOT EXPECTED TO REACH THE EDGE OF
   WW 629 /NCENTRAL NC/ UNTIL AROUND 23Z. HOWEVER...OVER NERN NC/SERN
   VA...ISOLATED SVR TSTM DEVELOPMENT MAY OCCUR WELL AHEAD OF THE
   CONVECTIVE LINE/S ALONG SEVERAL WEAKLY DEFINED SFC TROUGHS AND/OR
   THE OCEAN BREEZE FRONT. ALTHOUGH THE AIRMASS IMMEDIATELY EAST OF WW
   629 WAS ONLY MARGINALLY UNSTABLE...WITH MLCAPE FROM 500-1000
   J/KG...AN AXIS OF GREATER DWPTS AND INSTABILITY EXISTS OVER SERN
   VA/SRN DELMARVA PENINSULA AND NERN NC WITH MLCAPE UP TO 2000 J/KG.
   ACROSS THIS AREA...A GREATER SVR WIND/HAIL THREAT MAY OCCUR AS
   CONVECTION DEVELOPS OR MOVES INTO THESE AREAS LATER THIS AFTERNOON
   /AFTER 21Z/.
   
   ..CROSBIE.. 08/21/2007
   
   
   ATTN...WFO...AKQ...MHX...LWX...RAH...RNK...RLX...GSP...
   
   38277620 38457738 38747907 38287985 37698015 37428015
   36848015 36528071 36218121 36018151 35648175 35258019
   35127945 34937869 34897819 34987741 35207703 35607647
   35937617 36357599 37667554 37927541 38137530 38177529