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Hurricanes- Origin, formation, Effects, and MORE!

An overview of the formation of hurricanes for Mr. Harrison's 6th grade class.
by

Steve Harrison

on 19 May 2011

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Transcript of Hurricanes- Origin, formation, Effects, and MORE!

Hurricanes- They can ROCK you! How do they start? Hurricanes begin off the coast of Western Africa near the Equator. Hurricanes form when warm water near the equator evaporates quickly, rising quickly forming tall clouds and winds. When are they called typhoons or cyclones? Hurricanes are known as typhoons or cyclones when they form over the Indian Ocean or the Western Pacific Ocean. As this swirling storm picks up energy from the warm water it circulates over, it gains strength. When the wind reaches speeds of 65km per hour (40mph), it is now known as a Tropical Storm. (and it gets a name!) When the storm gains enough energy to blow 120km/hr (74mph), it is now known as a Hurricane Categories of Hurricanes (the Saffir-Simpson Scale) Category 1: Sustained winds between 74-95 mph (Juan) Category 2: Sustained winds between 96-110 mph (Floyd) Category 3: Sustained winds between 110-130 mph (Katrina) Category 4: Sustained winds between 131-155 mph (Charley) Category 5: Sustained winds above 156 mph (Andrew) A low-pressure system is created, and the air RUSHING in to fill the space (along with the Coriolis Effect) cause the air to spin in a circle around the low-pressure center, creating a 'tropical disturbance' Hurricanes forming NORTH of the equator spin counter-clockwise, where hurricanes forming SOUTH of the equator spin clockwise! To find out exactly WHY, click HERE: http://www.physicsforums.com/showthread.php?t=42593
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