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Mesoscale Discussion 819
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   MESOSCALE DISCUSSION 0819
   NWS STORM PREDICTION CENTER NORMAN OK
   0748 AM CDT THU MAY 08 2008
   
   AREAS AFFECTED...NRN MS...NW AL
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 081248Z - 081415Z
   
   THE THREAT FOR SUPERCELLS MAY INCREASE IN THE NEXT COUPLE OF HOURS
   ACROSS NE MS INTO NW AL...AND A WW MAY BECOME NECESSARY BY 14-15Z.
   
   A CLUSTER OF THUNDERSTORMS ACROSS NE MS IS BEGINNING TO SHOW SOME
   SIGNS OF INTENSIFICATION THIS MORNING...IN ADVANCE OF A MID LEVEL
   TROUGH MOVING EWD FROM AR/MO.  THE 12Z JAN SOUNDING SHOWED STEEP
   LAPSE RATES FROM 850-600 MB AND INCREASING LOW-LEVEL MOISTURE
   FEEDING THIS CONVECTION FROM THE SW.  AS THE LOW LEVELS DESTABILIZE
   THROUGH THE MORNING...THE CONVECTION WILL TEND TO ROOT NEAR THE
   SURFACE.  GIVEN MODERATE INSTABILITY...VERTICAL SHEAR WILL BE
   SUFFICIENT FOR SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL/DAMAGING
   WINDS...AND ISOLATED TORNADOES.
   
   ..THOMPSON.. 05/08/2008
   
   
   ATTN...WFO...BMX...HUN...MEG...JAN...
   
   33108789 32718890 32849026 33409049 33929024 34448989
   34818912 34878791 34918725 34348711 33658730 
   
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