tornado Essay

989 Words 4 Pages

A tornado is a violently rotating column of air that extends from a thunderstorm cloud to the earth’s surface. They are sometimes nicknamed twisters because of their shape and because of what they do. The winds in the tornadoes are usually 100mph or less. In +F4's they can exceed 250mph. They usually stay on a track of a few miles or less and are less than 100 yds. wide. For the development of tornadoes there are a few conditions required. An abundant low-level of moisture and unstable atmosphere is required not only for the tornado, but for a thunderstorm also. A “trigger”, which is a cold front or low level zone of converging winds, is needed to lift the moisture and the air. When the air rises , it becomes saturated and
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Recent research begins to recover that tornado formation is an extraordinary series of rapidly evolving storm scale processes . Forecasters can determine areas where instability and wind shear coexist , and NEXRAD Doppler Radar is one of the best indicators of impending tornado formation.Doppler radar displays swirling cloud-level winds that often precede a tornado and can help forecasters pinpoint areas where tornado formation may be occurring or is imminent . This gives meteorologists valuable lead time for the issuance of watches and warnings. The Super OutbreakThe super outbreak is one of the most infamous events that occurred in 1974. It was one of the most violent tornadic events ever on record in the United States .The 1974 Super Outbreak spawned 148 tornadoes, the largest number of tornadoes ever produced by one storm system. Thirty of the 148 tornadoes from this system were reported to be classified as either an F4 or F5 (on the Fujita-Pearson scale) Before the fourteen state rampage was over 300 people had been killed in 48 killer tornadoes. On the morning of April 3, an area of low pressure was located in central Kansas. A warm front extended east-northeastward through the lower Ohio River Valley. South of this front, extremely unstable air had gathered during the overnight hours and was rapidly spreading north. A cold front stretched from the area of low pressure south through Texas . At the upper levels of the atmosphere,

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