SPC MESOSCALE DISCUSSION 1933 FOR SRN AL AND THE WRN FL PANHANDLE
   CONCERNING...TORNADO WATCH 681...
   
   VALID 141217Z - 141400Z
   
   THE THREAT FOR ISOLATED/BRIEF TORNADOES CONTINUES THIS MORNING
   ACROSS SRN AL AND THE WRN FL PANHANDLE IN ASSOCIATION WITH
   LANDFALLING TROPICAL STORM HANNA. 
   
   NHC 14/12Z ADVISORY POSITION PLACES THE CENTER OF TROPICAL STORM
   HANNA NEAR 30.1N 88.9W OR JUST SOUTH OF THE MS COAST. PRIMARY
   THREAT OF TORNADOES IS WITH INNERMOST BAND JUST EAST OF THE CYCLONE
   CENTER...EXTENDING FROM THE ERN GULF OF MEXICO NNWWD INTO THE FAR
   WRN FL PANHANDLE AND MOBILE BAY VICINITY. VAD WIND PROFILE AT MOB
   INDICATES 30-40KT ESELY FLOW IN THE SFC-1KM LAYER WITH A CLUSTERING
   OF 50-60 LIGHTNING STRIKES IN THE COASTAL WATERS JUST SOUTH OF
   AL/FL BORDER BETWEEN 11-12Z. SFC-2KM SRH VALUES ARE NEAR 100 M2/S2.
   SRH VALUES ARE LIMITED SOMEWHAT BY MAINLY UNIDIRECTIONAL LOW-LEVEL
   WIND PROFILE AT MOBILE PRESENTLY. DESPITE THIS...MAGNITUDE OF LOW-
   LEVEL SHEAR AND MOVEMENT OF CONVECTIVE CELLS WITHIN THE SPIRAL BAND
   ONSHORE DURING THE NEXT 1-3 HOURS SUGGESTS THE THREAT OF ISOLATED
   TORNADOES ACROSS THE WW 681 AREA. GREATEST THREAT APPEARS LIKELY
   FROM MOBILE BAY EWD ACROSS FAR WRN FL PANHANDLE THROUGH THE MID-
   MORNING HOURS. 
   
   ..BANACOS.. 09/14/02