Well the forecast track I have been watching has changed drastically from what I saw yesterday. Now the track shows it heading directly for Miami, and then abruptly making a northerly turn right before land fall. So it seems obvious that they really don't know what it is going to do and everyone on the east coast of the USA needs to keep a sharp eye out for this storm.
https://www.ventusky.com/?p=34.4;-72.6;3&l=rain-3h&t=20170911/06&w=soft
https://www.ventusky.com/?p=34.4;-72.6;3&l=rain-3h&t=20170911/06&w=soft