Learn that the power of a tornado is measured by the F-scale, a rating system established by Dr. T. T. Fujita. Know that the F-scale is an attempt to relate visible damage to the strength of wind. Be aware that damage to structures can occur at any F-scale level from a tornado of any size or shape. Folk wisdom says tornadoes produce the deep, rumbling sound of a large train moving close by. But if the storm is moving through a developed area, there will be a cacophony of noise.
Tornadoes can carry and scatter lightweight debris for miles.
The USA's deadliest tornado outbreak occurred in the spring of 1925 when a tremendous storm raged across Missouri, Illinois and Indiana, spawning tornadoes that killed more than 600 people. Tornadoes have been measured at a width of over 2 miles. A waterspout is a tornado over water. Take no chances when a tornado warning is issued. Seek immediate shelter and keep posted by listening to the weather radio.