Tornadoes Essay

1565 words - 6 pages

A tornado is a violent windstorm characterized by a twisting, funnel-shaped cloud. It is spawned by a thunderstorm (or sometimes as a result of a hurricane) and produced when cool air overrides a layer of warm air, forcing the warm air to rise rapidly. Tornadoes can cause a lot of damage and even deaths. The damage from a tornado is a result of the high wind velocity and wind-blown debris. Tornado season is generally March through August, although tornadoes can occur at any time of year. They tend to occur in the afternoons and evenings: over 80 percent of all tornadoes strike between noon and midnight. From 1950-1995 the total number of tornadoes in Michigan was 722, with an average of 5 deaths and 3,217 injuries (70 a year average) resulting from the storm a year.
Tornadoes are rated on a scale called the Fujita Scale. The storms are labeled with the letter F and then a number 0-6. The Fujita Scale is used to rate the intensity of a tornado by examining the damage caused by the tornado after it has passed over a man-made structure. The table below shows the ratings for a tornado with the Fujita Scale.

The Fujita Scale
F-Scale Number     Intensity Phrase     Wind Speed     Type of Damage Done
F0     Gale tornado     40-72 mph     Some damage to chimneys; breaks branches off trees; pushes over shallow-rooted trees; damages sign boards.
F1     Moderate tornado     73-112 mph     The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed.
F2     Significant tornado     113-157 mph     Considerable damage. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light object missiles generated.
F3     Severe tornado     158-206 mph     Roof and some walls torn off well constructed houses; trains overturned; most trees in forests uprooted
F4     Devastating tornado     207-260 mph     Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.
F5     Incredible tornado     261-318 mph     Strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile sized missiles fly through the air in excess of 100 meters; trees debarked; steel...

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