MESOSCALE DISCUSSION 0478
   NWS STORM PREDICTION CENTER NORMAN OK
   1028 PM CDT WED MAR 19 2008
   
   AREAS AFFECTED...CNTRL VA...NCNTRL NC
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 200328Z - 200430Z
   
   THE WIND DAMAGE THREAT MAY INCREASE OVER THE NEXT 1 TO 2 HOURS WITH
   THE THREAT REMAINING ISOLATED. THE ACTIVITY WILL CONTINUE TO BE
   MONITORED IN CASE THE LINE STRENGTHENS ACROSS CNTRL VA AND NCNTRL
   NC. WW ISSUANCE WILL BE POSSIBLE IF THE LINE BECOMES MORE ORGANIZED
   LATE THIS EVENING.
   
   LATEST ANALYSIS SHOWS A COLD FRONT ADVANCING QUICKLY ACROSS THE
   APPALACHIAN MTNS WITH A NARROW LINE OF CONVECTION LOCATED JUST AHEAD
   OF THE FRONT. RUC ANALYSIS SHOWS VERY LITTLE INSTABILITY EAST OF THE
   BOUNDARY. HOWEVER...WATER VAPOR ANALYSIS SUGGESTS LARGE-SCALE ASCENT
   IS VERY STRONG ASSOCIATED WITH A VORTICITY MAX MOVING THROUGH THE
   CNTRL APPALACHIANS. IN ADDITION...THE ACTIVITY IS LOCATED ALONG THE
   AXIS OF A 50 TO 60 KT LOW-LEVEL JET AND THIS ALONG WITH
   UNIDIRECTIONAL FLOW IN THE BOUNDARY LAYER MAY RESULT IN AN ISOLATED
   WIND DAMAGE THREAT AS THE LINE MOVES TO THE EAST OF I-81.
   
   ..BROYLES.. 03/20/2008
   
   
   ATTN...WFO...AKQ...LWX...RAH...RNK...
   
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