ISAAC HAS MOVED A LITTLE TO THE LEFT OF PREVIOUS PROJECTIONS AND CENTER FIXES YIELD A 6- TO 12-HOUR AVERAGED MOTION OF 295/15. THE TRACK FORECAST CONTINUES TO BE CHALLENGING. THE DYNAMICAL MODELS SHOW THE TROPICAL STORM/HURRICANE GRADUALLY TURNING TO THE RIGHT AND HEADING FOR A BREAK IN THE SUBTROPICAL RIDGE. HOWEVER...THERE ARE SUBSTANTIAL DIFFERENCES AMONG THE MOST RELIABLE MODELS AS TO WHERE ISAAC MIGHT CROSS THE NORTHERN GULF COAST. THE U.K. MET. OFFICE AND ECMWF MODELS ARE ABOUT 300 N MI TO THE EAST OF THE GFS AT LANDFALL. IT SHOULD BE NOTED THAT NEARLY ALL OF THE GFS ENSMEBLE MEMBERS ARE EAST OF THE GFS CONTROL TRACK. BECAUSE OF THE WIDE MODEL SPREAD...THERE CONTINUES TO BE GREATER THAN USUAL TRACK FORECAST UNCERTAINTY.
THROUGHOUT THE PERIOD...IT IS IMPORTANT NOT TO FOCUS ON THE EXACT FORECAST TRACK DUE TO FORECAST UNCERTAINTIES AND THE FACT THAT SIGNIFICANT HAZARDS EXTEND WELL AWAY FROM THE CENTER.
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