MESOSCALE DISCUSSION 0490
   NWS STORM PREDICTION CENTER NORMAN OK
   1224 PM CDT SAT APR 14 2007
   
   AREAS AFFECTED...NRN AL...NWRN GA...SERN TN
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 141724Z - 141830Z
   
   LOW LEVEL WARM ADVECTION APPEARS TO BE THE DOMINANT CONTRIBUTOR IN
   NEWD EXPANSION OF ELEVATED CONVECTION NORTH OF RETREATING WARM
   FRONT.  LATEST SFC DIAGNOSTIC DATA SUGGESTS WARM FRONT IS NOW NEAR
   THE NRN EDGE OF WW141 AS SFC DEW POINTS ARE RISING ABOVE 60F THROUGH
   CNTRL AL.  STRONG VERTICAL SHEAR AND INCREASING INSTABILITY JUST
   ABOVE THE BOUNDARY LAYER MAY ULTIMATELY PROVE SUFFICIENT IN
   SUSTAINING ORGANIZED SEVERE THUNDERSTORMS ACROSS NRN AL...POSSIBLY
   SPREADING INTO SERN TN/NWRN GA.  NEAR-SFC BASED SUPERCELLS ALONG
   RETREATING WARM FRONT CERTAINLY BEAR WATCHING AS TORNADO POTENTIAL
   IS INCREASING ALONG THIS CORRIDOR.
   
   ..DARROW.. 04/14/2007
   
   
   ATTN...WFO...GSP...MRX...FFC...OHX...BMX...HUN...
   
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