In high-rise buildings, go to interior small rooms or hallways. In vehicles or mobile homes, leave them and go to a substantial structure. In open country, lie flat in the nearest ditch or ravine with your hands shielding your head. Take a portable radio and flashlight with you when taking shelter. A tornado is a violently rotating column of air which comes in contact with the ground.
Tornadoes vary greatly in size, intensity, and appearance.
The average movement of a tornado is 30 mph, but speeds of 70 mph have been reported. Wind speeds of between 100 to over 300 mph are possible. The greatest numbers of tornadoes have occurred in May, June, and July. Wisconsin averages almost 20 tornadoes per year. However, tornadoes may strike at any time, potentially with little or no warning.