Most hurricane shelters won't take horses. :)
I remember after Flloyd, my supervisor - who was a horse person - was part of a convoy of horse trailers going down there to rescue horses stranded on hilltops. I think they had to swim the horses to where the trailers were.
It'd be awful... Well, I just wouldn't do it. I wouldn't live where there are such weather extremes, either hurricanes or the super deep freeze of the upper midwest. It'd just make horsekeeping such a struggle and a worry.