Harvey has continued Rapid Intensification overnight. At 9am he was 948mb with 110mph winds. He is moving overall Northwest at 10mph. This forward speed is expected and beginning to slow. Harvey may be over the same general area for days. There are areas in Texas where this is a life threatening situation coming on. Heed local warnings. Some places deadly 9-12' surge is expected, devastating winds can't really be ruled out yet either.
Overall coastal areas along the Gulf Coast and East Coast should be gathering and at least planning for the unexpected. This could go a few different ways. There is uncertainty with different tropical entities close together like this. Either Harvey stays in the landfall area, maybe even comes back off shore and landfalls again more to the north but generally drowns a lot of Texas with rain and surge. While the wave near Florida develops on the east coast, maybe grazing North Carolina on the way out to sea. Or, Like GEOS-5 has insisted Harvey continues a more west track. Texas would be a hard hit but it wouldn't linger as long. Mexico gets lots of rain as the whole thing traverses land to get sucked into a Low in the East Pacific. If this happened the Low around Florida might develop (starting tomorrow) more on the west coast & over the state, then possibly run up the east coast. Either scenario several large areas could receive scary amounts of rain.
Rockport, TX just inland behind the barrier island. Source is Russpoint's Wundercam.
Corpus Christi, Texas on the barrier island. Source Joe Diver's Wundercam.
This one is more inland, between Bay City and Victoria, where one of the highest storm surges is forecast. Source is K5HAS's Wundercam.