Having a plan gives you and your animals the best chance of surviving. Prepare ahead of time by fitting animals with microchips, freeze branding, branding or lip tattoos. These are permanent identifications and all you need. You can label animals with your vet's name and number on one side and yours on another. If you are in a wind or tornado prone area, remember that wooden boards can become high speed and deadly objects to horses which do not have the ability to dodge 100 mph projectiles.
Opinions vary on whether horses are safer inside a barn or turned out in a tornado or hurricane.
Evacuation is always a better as a precaution than at the last minute if enough warning is given. In order to evacuate, you need your vehicles and trailers in working order. A broken trailer hitch or a flat tire can spell the difference between life and death for your horses if you only have a moments notice of an impending disaster and need to evacuate. In a tense evacuation situation, even the best of horses can panic. So it is important to have practiced loading your horses under adverse conditions such as in the dark or in the wind.