Someone recently asked, "What emergency supplies do you need to respond to a tornado?" The answer is that you need essentially the same emergency supplies that you would need to respond to any other disaster. If a tornado hits close enough to do damage to your home or knock out essential utilities and services, you may have to evacuate or be prepared to shelter-in-place without the benefit of all of the conveniences which we take for granted.
Whether you have to evacuate of shelter-in-place after a tornado of some other disaster, you may need to provide for 10 emergency essential needs: water, food, breathing protection, first aid, shelter, warmth, communication, light, tools, sanitation & hygiene. A well designed 72 hour emergency kit with basic supplies can help you meet each of these needs whether you stay or have to go.
Ready.gov provides a helpful list of emergency supplies. You can build your own tornado emergency kit or purchase one.