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 just moved down there this past summer, so they've no experience. They're living on Dutch
Island, which, obviously, is an island. They've been moving all the important stuff upstairs. I'm
keeping my fingers crossed for them.