The center of the storm is 150 miles southeast of Charleston and heavy rain is already onshore.
It is moving toward the northwest at 13mph, and that motion will bring the center to the coastline on Sunday morning, though it won't be a very dramatic landfall. The biggest impact will be rain, and that is already occurring; however, a tropical storm warning is in effect for the entire South Carolina coast.
It's passing over the warm waters of the Gulf Stream, but as you can see from the satellite image at the top, it is strongly sheared which is limiting intensification. That could change somewhat in the 18 hours between this writing and when it reaches the coastline. The strongest winds in Charleston will be from about midnight through noon on Sunday and could gust to 45-50mph.
I have a long updating radar loop from Charleston available at http://andrew.rsmas.miami.edu/bmcnoldy/tropics/bonnie16/Bonnie_28-30May16_CLX.gif
(it has Bonnie in the filename, but it is not named yet)
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