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Falling debris of mass destruction!
Most deaths in a tornado are from being struck by flying or falling debris.
Rainwhisker of ThunderClan died in battle while defending his Clan. He was tragically killed by falling debris during the battle.
your unit control center
Your Unit Control Center (UCC)
your unit comtrol center
Your Unit Control Center
your unit control center
your unit Control Center
When you hit the ground. While they are falling they are in the air, and falling in and of itself will not kill you. The impact will always kill you -- unless you have a heart attack during the fall.
Try to find an area where there is nothing above you and then get as low to the ground as you can. But if you can, try to get to a vehicle, because that will offer you more protection from falling debris and ground collapse.
The main threat in a tornado is flying and falling debris. If you make yourself a smaller target you are less likely to be hit by something.