Tornadoes are classified using what's known as the EF scale, which factors in estimated wind speeds and related damage. Wisconsin started keeping official track of tornadoes in 1950. According to ...

Instead, after a tornado hits, the U.S. National Weather Service uses a rating system it adopted in 1973 called the Fujita Scale. Devised by meteorologist Theodore Fujita in 1970, the F-scale ...

The outlook ranges from levels one to five with one being the lowest on the scale. Level one = Marginal ... Considerable: This classification is used when wind speeds reach 70 mph and/or hail ...