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Hurricanes and Tornadoes Hurricanes- are cyclones that have winds exceeding 115 km/hr(75 mi/hr) and an average diameter of 600 km; these winds surround an area of extremely low pressure Hurricanes form over tropical oceans Hurricanes are heat engines that are fueled by the heat stored in the water vapor. Hurricane season is late summer and early fall, when ocean water is at its highest temperature. Hurricanes do not have fronts Eye of the hurricane is the center and it’s very calm. Hurricanes lose strength 1. If they move onto land, cutting off the storms source of warm, moist air. 2. If they move north into cooler ocean waters that cannot supply warm, moist air. $$The Storm Surge of a Hurricane causes the most damage. Storm Surge- forms when the hurricane piles up water along the shore and then blows it inland In 1991 a Tropical Cyclone produced a 20 ft. storm surge in Bangladesh killing 139,000 people and leaving over 9 million homeless. Tornado- a narrow, funnel-shaped column of spiraling winds that extends downwards from a cumulonimbus cloud and touches the ground Strongest winds are about 360-500km/hr (300 mi/hr) Pressure inside the tornado is extremely low. Occur near cold fronts. Are usually less than a mile wide and only last a few minutes. Formation of Tornadoes 1. Warm, moist air from the Gulf of Mexico moves Northward. 2. Cold, dry air from Canada moves Southward. 3. These two air masses meet and form a Cold front. 4. Thunderstorms are produced at a Cold front. 5. These thunderstorms could spawn a tornado.