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Narrator: 27 storms are Arlene to

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Zeta. Lets exam what made conditions so

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favorable for Atlantic storm formation in 2005.

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We begin with the ocean;

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these are sea surface temperatures for the 2005

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hurricane season, changing through time as the calendar advances.

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Warm water powers hurricanes, orange and

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yellow areas, shows zones with water warmer than 82

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degrees; the threshold favorable for hurricane development.

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Lets start the season again,

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this time adding clouds back into the picture.

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Atlantic-based hurricanes typically form between June

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and November. Hurricanes often start as

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atmospheric disturbances of the coast of West Africa. Once out

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into the warm summer waters of the Mid-Atlantic, some ripples

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begin to rotate and feeding of off warm water strengthen into

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hurricanes. Hurricanes require warm water to heat

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air above the ocean causing a drop in air pressure. Lower

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air pressures sucks more water vapor into the storm, causing

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storms to strengthen. As hurricanes pass over warm water

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they leave trails of relatively cooler water so called,

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cold water trails. Numbers displayed over storms

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tracks indicate hurricane category changes.

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Strong shearing winds in the troposphere can disrupt this

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process weakening young storms, but measurements indicate

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that there was very little shearing wind activity in 2005 to

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impede storm formation. Hurricanes are rare

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phenomena; only about 80 or 90 appear worldwide

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every year.

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Storms

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stalked the Atlantic Ocean and Easter Seaboard from June

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until early winter in 2005 and the record books are

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groaning under the strain of such a busy year. Consider this list of

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superlatives. An average year produces roughly 10

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storms, 27 named storms formed in 2005.

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An average year produces 6 hurricanes,

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15 formed in 2005. An average year

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produces two major hurricanes. Seven formed in

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2005 on average one category 5

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hurricane forms every three years. In 2005

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there were three Katrina, Rita, and Wilma.

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Wilma was the most intense Atlantic hurricane ever recorded,

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Katrina fourth, Rita sixth. But Katrina

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was the most destructive hurricane ever to hit the United States. The

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total losses from storms in 2005 include more than

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1.200 lives and potentially more than 100

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billion dollars.

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This visualization shows some of the

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actual data that NASA and NOAA satellites measured this season.

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Data used to predict the paths and intensities of hurricanes.

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Satellite data play a vital role in helping us

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understand the land, ocean, and atmosphere systems

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that have such dramatic effects on our lives.

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