Tuesday, March 2, 2010

-:: What are Hurricanes..??-::-





Hurricane are huge storms, it can be up to 600 miles across and have strong winds speeds over 160 miles(257 kilometers) an hour and unleash more than 2.4 trillion gallons (9 trillion liters) of rain a day, These same tropical storms are known as cyclones. The center of the storm is the calmest part or it also can call the eye and has only light winds and fair weather, the low level storm winds blow counterclockwise around the eye in the Northern Hemisphere(clockwise in the Southern Hemisphere), and above 9 km, wind spiral outwards and clockwise in the Northern Hemisphere.









Hurricanes are enormous heat engines that generate energy on a staggering scale. They draw heat from warm, moist ocean air and release it through condensation of water vapor in thunderstorms. Hurricanes spin around a low-pressure center known as the “eye.” Sinking air makes this 20- to 30-mile-wide (32- to 48-kilometer-wide) area notoriously calm. But the eye is surrounded by a circular “eye wall” that hosts the storm’s strongest winds and rain.


Hurricane has 6 categories based on their scale for wind speeds are:
Categories 1 – has sustained winds from 74 to 95 mph.
Categories 2 – has sustained winds from 96 to 110 mph.
Categories 3 – has sustained winds from 111 to 130 mph.
Categories 4 – has sustained winds from 131 to 155 mph.
Categories 5 – has sustained winds greater than 155 mph.
Categories 6 – would be greater than 175 or 180 mph

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