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Geosci 105 - tries to slide in underneath it and develops...

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-Hurricanes build in intensity over warm ocean water, dissipate over cooler water and land, and move in predictable ways - Why do (northern hemisphere) tropical cyclones rotate counter clockwise? -coriolis effect -air starts moving toward a zone of low pressure and veers off course to right, core of tropical cyclones rotating to left -eye of hurricane is clear because air moves upwards into atmosphere and is driven by evaporation but as it moves otward, it’s at a higher elevation and needs to drop its water -extratropical cyclones occur at boundary of ferrel cell and polar cell, and are winter weather disturbances- the famous “ nor’easters’ -in region over land or ocean, but form strongly over ocean, the air from the ferrel cell is moving south and warm and the polar is moving north and cold air and they move parallel they begin to twist because warm air is less dense and tries to rise if cold air can get underneath it. The warm air goes up in the atmosphere and the cold air
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Unformatted text preview: tries to slide in underneath it and develops curvature and creates low pressure. Air keeps rushing in and the curvature becomes pronounced at the low pressure point and all the air starts moving in to and picks up water from ocean.-need a lot of warm humid air What fuels hurricanes and typhoons?-fundamental process is storage and release of latent heat-evaporating water tores vast latent heat of evaporation-condensing water in clouds (rain) releases that latent -Tropical Cyclone Structure-up to 1000 km in diameter up to 15 km tall-eye: calm center 13-16 km in diameter, no clouds-Saffir-simpson Scale of Hurricane Intensity-Category:-1 winds: 74-94 mph-2 winds: 96-110 mph-wind speed increases, scale goes up-Destructiveness of hurricanes and typhoons-high winds-intense rainfall-flooding-landslides-flooding by storm surge: the real cause of most damage-Deadliest Hurricane in US history was: Galveston Hurricane 1900...
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