So. The idea is this thing is going to chill off the coast of SE NC somewhere, and come Southwest. Is it going to ride the coast? Is it going to make landfall in SE NC? All of these factors greatly affect what happens downstream here in South Carolina, especially.
At this point, I'd expect a rapidly weakening tropical storm coming through the Midlands of SC somewhere. We won't be seeing the horrendous rains anything like the 1000 year flood by any means, but winds coupled with heavy rains will make things tedious.
The eventual track will dictate how much wind and rain we see. For example, we'd see a lot more rain in Columbia, if the system cuts through the Southern part of our state. If it cuts through the North of Columbia, The impacts will be less intense, but put places like Charlotte in a situation of heavy rain.
Either way, I expect the name "Florence" to be retired for the amount of damage and rainfall she drops on SE NC alone. If she decides to stay off shore and track back West before coming into the Charleston area, the majority of SC is in for it.
TLDR. Expect tropical force conditions in a big chunk of SC. We don't know where her center will track, so that makes a forecast of rain and wind impossible to come up with right now.