Scale of Saffir-Simpson

See also: Simpson

The scale of Saffir-Simpson is the scale of classification of the intensity of the tropical cyclones being formed in the western Hémisphère, including the cyclonic basins of the Atlantic Ocean and the Pacific Ocean northern in the east of the Date-line. One uses other classifications in the other cyclonic basins.

It is graduated in five levels of intensity, corresponding to intervals speeds of standardized winds. To classify a cyclone on this scale, one records the speed of the winds supported during a minute with a height of 10 Mètre S (33 foot S), one calculates the average obtained that one compares with the intervals (See the categories of intensity). To describe a cyclone passed, one uses the highest graduation reached (Example: Katrina was of category 5).

History

It was developed in 1969 by the civil engineer Herbert Saffir and the doctor Bob Simpson, director of the National Hurricane Center at that time. Saffir had developed this scale at the request of the World Meteorological Organization (UNO) to describe the potential effects of a tropical cyclone on the human infrastructures. One officialized his use for the cyclonic basins of the western Hémisphère.

Categories of intensity

  • Definitions according to the Weather service of Canada the National Weather American Service

  • Wave of storm: raising of the sea level due to the winds and the pressure of the cyclone. She is added to the level of the regular tide along the coasts when such a system approaches some.

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