MESOSCALE DISCUSSION 0127
   NWS STORM PREDICTION CENTER NORMAN OK
   0322 PM CST WED FEB 18 2009
   
   AREAS AFFECTED...CNTRL MS INTO NERN GA
   
   CONCERNING...TORNADO WATCH 24...
   
   VALID 182122Z - 182245Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 24 CONTINUES.
   
   THROUGH 23Z...EXPECT THE GREATEST THREAT FOR SUPERCELLS CAPABLE OF
   LARGE HAIL...DAMAGING WINDS AND TORNADOES TO EXIST OVER NERN PORTION
   OF WW AREA...NAMELY FROM JUST NE OF BHM TO NEAR OR E OF RMG.
   
   AS OF 21Z...REGIONAL RADAR IMAGERY INDICATED SEVERE STORMS
   /INCLUDING SUPERCELLS/ OVER CHATTOOGA AND FLOYD COUNTIES IN FAR NWRN
   GA AND ST. CLAIR COUNTY AL MOVING GENERALLY EWD AT 45-50 KT.  AIR
   MASS IN WAKE OF WARM FRONTAL PASSAGE OVER NERN GA IS RAPIDLY
   DESTABILIZING AND MODIFICATION OF 18Z ATL/BHM SOUNDINGS FOR CURRENT
   SURFACE CONDITIONS YIELDS MLCAPE APPROACHING 1000 J/KG.  IN ADDITION
   TO SMALLER T/TD SPREADS AND RESULTANT LOWER LCL HEIGHTS OVER NERN AL
   INTO NWRN GA...LOCAL VWPS AND RUC OBJECTIVE FIELDS INDICATE NOTABLY
   STRONGER LOW-LEVEL SHEAR WITH 0-1 KM SHEAR OF 30-35 KT AND EFFECTIVE
   SRH VALUES OF 300-400 M2/S2.  AS SUCH...ONGOING SUPERCELLS WILL
   REMAIN CAPABLE OF TORNADOES IN ADDITION TO LARGE HAIL AND DAMAGING
   WIND GUSTS.
   
   FARTHER W...AN ISOLATED STORM CONTINUES TO ORGANIZE OVER LAUDERDALE
   COUNTY MS AS OF 21Z.  GIVEN THE RATHER STRONGLY SHEARED ENVIRONMENT
   AND SIMILAR THERMODYNAMIC CONDITIONS IN PLACE THROUGH CNTRL
   AL...THIS STORM MAY BE ABLE TO PERSIST FOR THE NEXT FEW HOURS WITH
   THE THREAT FOR DAMAGING WINDS...HAIL AND PERHAPS A TORNADO.
   
   ..MEAD.. 02/18/2009
   
   
   ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MOB...MEG...JAN...
   
   LAT...LON   32829066 34538802 35458702 35248444 33578453 32788500
               31918596 31678775 31648976 31809091 32829066