MESOSCALE DISCUSSION 2159
   NWS STORM PREDICTION CENTER NORMAN OK
   1049 PM CST WED NOV 21 2007
   
   AREAS AFFECTED...WRN FL PANHANDLE/SRN-SERN AL
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 220449Z - 220615Z
   
   POTENTIAL EXISTS FOR ADDITIONAL TSTM DEVELOPMENT IN A CORRIDOR FROM
   THE NORTH CENTRAL GULF OF MEXICO /OFFSHORE OF LA AND WRN FL
   PANHANDLE/ NEWD INTO SERN AL DURING THE NEXT SEVERAL HOURS AIDED BY
   ASCENT ATTENDANT TO A SERIES OF WEAK SUBTROPICAL IMPULSES.
   
   EFFECTIVE BULK SHEAR WILL REMAIN SUFFICIENT FOR ROTATING UPDRAFTS
   AND POTENTIAL FOR SUPERCELLS AS RECENTLY INDICATED BY REGIONAL
   RADARS WITH CELLS TRACKING NWD ACROSS THE WRN FL PANHANDLE SINCE
   03Z.  WEAK INSTABILITY IS EXPECTED TO LIMIT THE NUMBER OF STRONGER
   STORMS AND ANY SEVERE WEATHER THREAT.  ALTHOUGH WSR-88D VADS
   INDICATED FAVORABLE DEEP LAYER AND LOW LEVEL DIRECTIONAL SHEAR...
   WEAKER WINDS BETWEEN 1-2 KM AGL /AROUND 20 KT/ SUGGEST THE THREAT OF
   A TORNADO SHOULD BE RATHER LOW.  THE GREATEST POTENTIAL FOR THIS
   THREAT MAY DEVELOP WITH ANY ROTATING STORMS THAT MOVE ONSHORE FROM
   THE NRN GULF...BUT AGAIN WEAK INSTABILITY IS EXPECTED TO LIMIT THIS
   THREAT.
   
   ..PETERS.. 11/22/2007
   
   
   ATTN...WFO...TAE...MOB...
   
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