You are not seeing effects of the hurricane yet, it is south of Miami right now.
You have an occluded front parked over you that is bringing in Atlantic moisture, it has a low pressure ridge sitting on the mountains and you have a wedge effect of the moisture being packed against the mountains with no where to go except rain.
Your system hung out in Ga for 5 days before going north to you. We got about 8 inches of rain from it, and still have some of it hanging around.
Had the hurricane run in over top of that the flooding would have been really bad due to the saturated ground.
From what I’m seeing, Joachim is forcing this storm inland. Its slow enough to be sucking up massive amounts of moisture. It’s still moving north west. If it wasn’t for Joachim, this storm could have just as easily traveled north by northeast up the coast and not have dumped so much rain inland.