https://www.backyardchickensmama.com/ho ... -disaster/
This article recognizes making sure you are safe and gives more limited advice:
https://pethelpful.com/farm-pets/Prepar ... re-Weather
We are all vulnerable during severe weather.
The barn is old, but it is fairly solid. It has metal siding and a pretty strong frame on a cement pad. There's really not much inside the coop that can fall. The ceiling is low too, so unless it takes a direct hit from a tornado strong enough to rip it off of the foundation or tear it apart, anything inside will probably survive.