Admittedly I haven't read every single post here so I may be repeating something.
The tornadoes in the SE USA this week brought memories back of when we had a bad one miss us by half a block. It was almost two weeks without power, and an apartment that wouldn't allow generators. Even if they were allowed, the area was banned for a few days due to natural gas leaks causing possible fires or worse.
Besides being prepared to keep your fish alive at home, consider finding a fish buddy close to you, but not too close, so you have a place to take your fish if needed. I was able to move my fish to a local pet shop and paid them $30 for a month of boarding for using 4 of their tanks. It was a lifesaver to my fish and a few other too. They ended up boarding quite a few fish including a koi that lost it's pond from the tornado and quite a few scales and half a tail. It may not be the most important thing needing done after a bad storm, but it may help soemone worry just a little less. Please check on your friends in the SE USA.