If in a vehicle, leave it and go to the nearest building, or the nearest ditch, and lie flat. Do not try to outrun a tornado in your vehicle. Thunderstorms are very dangerous, even when no tornadoes are formed. Lightning kills more people each year than tornadoes. Heavy rain from thunderstorms can lead to flash flooding .
Strong winds can produce tornado-like damage.
Hail can cause damage to crops and vehicles. Seek shelter before the storm arrives. Get out of boats, water, and swimming pools. If no sturdy shelter is available, get inside a hardtop automobile. If outside, find a low spot away from fences, trees and poles.