Trying to remember the last time (if ever) I have read a Forecast Discussion that called for a tropical cyclone to be "Subtropical" at Day 5 (instead of the usual "Post-Tropical," or "Extratropical," or "Dissipated"). Looks like NHC is giving some heavy consideration to model runs that do indeed show a strong possibility of a 'Perfect Storm.'
BY 120 HOURS...SANDY IS EXPECTED TO INTERACT WITH A DEEP UPPER-LEVEL TROUGH THAT COULD INDUCE TRANSITION INTO A SIGNIFICANT SUBTROPICAL CYCLONE. THE OFFICIAL INTENSITY FORECAST IS HIGHER THAN THE PREVIOUS ADVISORY THROUGH 48 HOURS...AND CLOSELY FOLLOWS A BLEND OF THE ICON...IV15...IVCN INTENSITY CONSENSUS MODELS.