It's rolling the dice a bit but from what I've seen of forecasts Irma
will likely be a Cat 1 storm by the time it hits Georgia or the
Carolina's. If it tracts up the east coast of Florida much of it's
energy will be lost. I wouldn't be overly concerned with a Cat 1, but
if their area is prone to flooding, getting out of Dodge might still be
a good idea.
They keep waffling on how strong it will be when it hits our coast. Last thing I saw had the eye back out over water for most of its trip up Florida, then back up to Cat 3 before landfall around Hilton Head. It'll be bad for HH, Savannah and Beaufort/Parris Island, but the good news is if it tracks north there's pretty much nothing but a couple of small towns, swamps. timber and an occasional tenant house for 100 miles. No big population centers down there.