Hurricanes - HurricanesandNoreasters(Ch14)...

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Hurricanes and Nor’easters (Ch 14) Hurricanes and Tropical Storms Well organized large circulating storms that originate over tropical waters. High evaporation rates and steering winds contribute to storm development. Tropical Storm Terms Terminology regional:   Hurricane  in Americas, eastern Pacific;  Typhoon  in Western  Pacific;  Cyclone  in Indian Ocean and Southwest Pacific Hurricane: 3 Key ingredients 1) Warm ocean water over 80 degrees farenheight is the fuel for the hurricane 2) Favorable winds aloft which allows the hurricane to grow vertically 3) Coriolis effect which provides rotation of the storm  Hurricane energy machine Hot humid air over warm water 5 degrees to 20 degrees N or S- unstable (less dense  à moves  upward in atmosphere)  -Rising air cools and condenses- releases latent heat energy (heat  à  phase change of liquid to  gas as water evaporated)  -More rising, condensing, latent energy release -Continues to organize *atmospheric pressure goes down and wind speeds increase) as  convection extends upward -Rotation of inflowing air improves circulation -Central part is called eye and the eyewall is where winds are strongest and at the bottom are  rain bands where the condensation is going on- inside the eye is quiet and very humid and  sticky What Happens Rising air and condensation builds into ‘chimney’ of thunderstorms Warm, moist air rises and spreads at top of chimney Warm air expands, cools and releases latent heat Eye of hurricane is as much as 20 o C warmer than surrounding air Rising air pulls more air into center of hurricane at low elevations Convection strengthens when air rises to high altitude without strong winds to shear off 
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This note was uploaded on 02/21/2010 for the course GEOL 116 taught by Professor Kruger during the Spring '09 term at Binghamton University.

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Hurricanes - HurricanesandNoreasters(Ch14)...

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