The forecast has become more uncertain after 72 h due to
large eastward shifts by the ECMWF, Canadian, and HWRF models
related to forecasts of the mid- to upper-level trough over the
southeastern United States. The bulk of the guidance now calls for
Irma to turn northward between 78W-80W, moving near or over the
Florida east coast or the northwestern Bahamas. The official
forecast has also been shifted eastward, but out of respect for the
previous forecast and the possibility the guidance may shift back
to the west, it lies to the left of the bulk of the guidance. The
forecast now calls for landfall in south Florida between 96-120 h.
Users are reminded to not focus on the exact forecast track,
especially at the longer ranges, since the average NHC track errors
are about 175 and 225 statute miles at days 4 and 5, respectively.