MESOSCALE DISCUSSION 0347
   NWS STORM PREDICTION CENTER NORMAN OK
   0103 PM CST TUE MAR 04 2008
   
   AREAS AFFECTED...WRN NC/SC
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 041903Z - 042100Z
   
   SEVERE THREAT IS EXPECTED TO INCREASE BY THE 04/21-05/00Z TIME
   FRAME...AND A TORNADO WATCH WILL LIKELY BE NEEDED LATE THIS
   AFTERNOON.
   
   STRONGER 2 HOUR SURFACE PRESSURE FALLS ARE NOW DEVELOPING TO THE LEE
   OF THE GREAT SMOKY MOUNTAINS/SOUTHERN BLUE RIDGE.  AND...THIS IS
   WHERE MODELS ARE SUGGESTIVE OF THE DEVELOPMENT OF A SECONDARY
   WAVE/MESO LOW LATE THIS AFTERNOON.  AS A WEAKENING PRE-FRONTAL BAND
   OF CONVECTION SPREADS OFF TO THE EAST...AT LEAST A BRIEF PERIOD OF
   SURFACE HEATING APPEARS LIKELY PRIOR TO THE APPROACH OF FRONTAL
   SQUALL LINE WHICH IS IN THE PROCESS OF SLOWLY INTENSIFYING ACROSS
   NORTHWESTERN GEORGIA.  
   
   THE BOUNDARY LAYER HAS ALREADY BECOME RATHER MOIST/POTENTIALLY
   POSITIVELY BUOYANT...AND...WITH THE ONSET OF MID-LEVEL
   COOLING...CONDITIONAL AND CONVECTIVE INSTABILITY IS EXPECTED TO
   INCREASE ACROSS THE PIEDMONT DURING THE 21-23Z TIME FRAME.  THE
   APPROACH OF A 100+ KT 500 MB JET STREAK IS EXPECTED TO BE
   ACCOMPANIED BY INTENSIFICATION OF A SOUTHERLY LOW-LEVEL JET FROM
   50-70 KT...WHICH WILL CONTRIBUTE TO STRONG DEEP LAYER/EXTREME LOW
   -LEVEL SHEAR.  IN ADDITION TO THE POTENTIAL FOR DAMAGING WINDS WITH
   THE SQUALL LINE...POTENTIAL WILL EXIST FOR STRONG TORNADOES IN
   SUPERCELLS WITHIN AND AHEAD OF LINE.  THIS COULD AFFECT THE
   CHARLOTTE NC/COLUMBIA SC AREAS BY 05/00Z.
   
   ..KERR.. 03/04/2008
   
   
   ATTN...WFO...RAH...CAE...GSP...