Most of the deadliest tornadoes in U.S. history occurred prior to 1950. That was largely because the ability to provide advance warning that a tornado was immenent was nonexistant. But with the advent of not only better weather predicting techniques but warning systems such as horns and sirens within communities, casualities from tornadoes were significantly decreased because better advance warning was possible. And with the development of Doppler radar, the warning got even better, further reducing the death toll and injuries that had been associated with these violent storms in the past.

Below is a list of the 10 deadliest tornadoes in America's history according to the Tornado Project Online!