(please be patient for any results because I have to run to class)
I think Ophelia will likely pass closer to Cape Cod than is currently forecast for several reasons.
The American and Global models this morning are rather undecided, after slightly better agreement last night, many of the shorter range globals have moved to the west (even while the GFS and NOGAPS have moved further east,) the world's best (ECMWF) remains a little further east than some of the other globals, but has been having serious trouble with this storm (as evident from the fact that it had landfall in New Orleans for several runs in a row, throwing several off,) so may carry less weight than normal.
Looking at a couple of the further west solutions, the GEM (Canadian,) UKMET, and ETA/NAM (extrapolated) are the main suites with the western track... with the GEM tracking into SNE, and the UKMET tracking just outside the Cape (harder to tell due to lower resolution of the extended 120 hr UKMET.)
The NAM at 84 hrs is tracking NNE:
The GEM at impact:
the crappy UKMET map:
Normally, while looking and seeing most tropical models in such agreement this close, I would probably make a forecast only weighing the globals slightly... the globals, while more powerful and better, are not designed for TS's, so it can be hard for them... however, I will borrow an argument from an NECN met now... the heights across the east are much higher and have been much higher for days... this confluent flow will slow down the shortwave expected to kick Ophelia east... and therefore a longer northern component can be expected.
I expect Ophelia to track between Cape Cod and Nantucket Friday, with heavy rains and gusty winds for Southern New England Thursday and Friday... rains of 2-5", with locally higher amounts... TS winds should be confined to the Cape and Islands... but gusts to 50 may be felt inland as well...
bye for now!