Think it is saver on roof. Winds are tropical now. And you are wet either way.
The ABC station is recommending people get on their roofs (not in their attics) if need be. If people have, say 4’ of water in the house, and no ladder, that might be tough to do from outside the house. Then there is the threat of severe t-storms, lightning, even tornados. One can run out of good options in a hurry.
I’d go to the attic & hack through the roof if need be (as I have tools to do so.)