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Tropical cyclones PDF Print E-mail
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Monday, 05 October 2009
 These are deep arising widths. Distinguished by high values of pressure gradients and therefore brings a unique strength of the winds and torrential rains. If the wind speed reaches 120 km / h, are called hurricanes. Hurricane names are used in the area of the West Indies and Central America and Northern Europe. In India, cyclones are called, while on the coasts of eastern and south-east Asia are referred to as typhoons. Although there are all too often (on average 40-50 times a year), any appearance of the cyclone is widely reported in the media as a specific phenomenon, with predictable consequences is difficult (if given the speed and the wind accompanying the probable route of movement).


Tropical cyclones are atmospheric disturbances on an inversion of the vertical axis of symmetry, which arises in tropical latitudes. Formed above the sea, where the surface water temperature is above 27o C and arrears over it a thick layer of warm and moist air. Do not occur directly at the equator, but only at the waist above 5 ° of latitude north and south is likely due to too small (no Coriolis effect at the equator). The maps are synoptic tropical cyclone is visible as a density of nearly circular isobar, covering an area with a diameter of 160-650 km, and sometimes much more. Tropical cyclone reaches to a height of 11-13 km. Atmospheric pressure at its center is about 950 hPa, but repeatedly reported even lower pressure of 900 hPa, but in contrast to the width of extreme cyclones pressure in the center of the cyclone is not its cause, and the only effect of rotational movement.

     The most typical feature of the structure of a tropical cyclone's center is devoid of clouds, with a very weak wind, and even silence, called the eye. It has a circular or oval shape and a diameter of 10-60 km. Directly to the adjacent zone of strongest winds.

Last Updated ( Tuesday, 27 October 2009 )
 
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