MESOSCALE DISCUSSION 0263
   NWS STORM PREDICTION CENTER NORMAN OK
   0734 PM CST SUN FEB 17 2008
   
   AREAS AFFECTED...PORTIONS GA...FL PANHANDLE...SERN
   AL...SWRN/W-CENTRAL SC.
   
   CONCERNING...TORNADO WATCH 63...64...65...
   
   VALID 180134Z - 180230Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH
   63...64...65...CONTINUES.
   
   PORTIONS SC AND ERN GA ARE BEING MONITORED FOR POSSIBLE WW. 
   REMAINDER WW 64 MAY BE CANCELED BEFORE...OR ALLOWED TO EXPIRE
   AT...SCHEDULED 02Z DEMISE.  WIDELY SCATTERED TSTMS ACROSS E-CENTRAL
   AL INTO W-CENTRAL GA -- BEHIND MAIN LINE OF TSTMS -- MAY POSE
   BRIEF/MRGL SVR THREAT BUT WILL BE ENTERING PROGRESSIVELY MORE STABLE
   AND UNFAVORABLE AIR MASS WITH EWD EXTENT.  PREVIOUSLY
   LONG-TRACK/TORNADIC SUPERCELL WAS ABSORBED INTO NRN END OF MAIN
   CONVECTIVE BAND ACROSS HANCOCK COUNTY GA DURING PAST HOUR...BUT
   CONTAINS EMBEDDED/PERSISTENT MESOVORTEX THAT COULD POSE THREAT OF
   DAMAGING GUSTS OR BRIEF TORNADO NEWD TOWARD PORTIONS
   LINCOLN/COLUMBIA COUNTIES GA AND MCCORMICK COUNTY SC.  RUC SOUNDINGS
   AND MODIFIED RAOBS SHOW MOST BUOYANCY REMAINS ELEVATED ABOVE
   RELATIVELY STABLE NEAR-SFC LAYER...WITH MUCAPES 200-400 J/KG. 
   HOWEVER...UPSTREAM SFC AIR OVER ERN GA AND COASTAL SC CONTAINS LOW
   60S F SFC DEW POINTS...WITH SOME SBCAPE IN ACCORDINGLY ADJUSTED
   PROFILES.  VERTICAL SHEAR PROFILES MAY REMAIN FAVORABLE FOR DAMAGING
   WIND...ESPECIALLY WITH LEWP/BOW STRUCTURES...BUT LIMITING FACTOR
   WILL BE WEAKNESS OF INSTABILITY.
   
   FARTHER S...WRN PORTIONS WW 65 OVERLAID/SUPERSEDED ERN PORTIONS WW
   63...AND WILL MAINTAIN SVR THREAT OVER THAT AREA FOR AT LEAST
   ANOTHER 2-3 HOURS.  WRN PORTION WW 63 -- ACROSS SERN AL AND WRN FL
   PANHANDLE -- IS SCHEDULED TO EXPIRE AT 02Z...ALTHOUGH STG/DAMAGING
   GUSTS AND ISOLATED HAIL MAY OCCUR FROM TSTMS LINGERING ACROSS THAT
   AREA THROUGH ABOUT 03Z.  RICHEST LOW LEVEL THETAE WILL REMAIN OVER
   PORTIONS S-CENTRAL/SWRN GA AND CENTRAL/ERN FL PANHANDLE...AMIDST
   VERTICAL SHEAR PROFILES THAT VWP...RAOBS AND MODEL SOUNDINGS
   INDICATE WILL REMAIN SUITABLE FOR SUPERCELLS AND BOWS.  TLH RAOB
   INDICATES EFFECTIVE INFLOW PARCELS MAY REMAIN ROOTED AT OR VERY
   CLOSE TO SFC FOR A FEW MORE HOURS WITH DEW POINTS LOW-MID 60S
   F...DESPITE WEAK 0-2 KM LAPSE RATES.
   
   ..EDWARDS.. 02/18/2008
   
   
   ATTN...WFO...CHS...CAE...GSP...JAX...FFC...TAE...MOB...
   
   30378673 31358561 32178412 32338332 33338290 33668283
   34078223 33958129 32958102 31858245 30728314 29658342
   29968377 30118401 30078437 29908432 29588500 29688521
   29658534 29898543 30038555 30288603