Hurricanes 0.0 / 5 ? GeographyNatural hazardsGCSEAQA Created by: serenaelstsCreated on: 17-03-15 19:29 How hurricanes form (1) Hurricanes need a lot of heat to form, which is why they usually occur over tropical seas (at least 26°C). 1 of 9 How hurricanes form (2) The sun is close to the equator, providing energy to heat the ocean. 2 of 9 How hurricanes form (3) The warm ocean heats the air above it causing it to rise rapidly. 3 of 9 How hurricanes form (4) Water evaporates quickly from the hot surface of the ocean, so the rising air contains great amounts of water vapour. 4 of 9 How hurricanes form (5) The rising air starts to spin (clockwise in the northern hemisphere) 5 of 9 How hurricanes form (6) The centre of the storm - the eye - is calm. 6 of 9 How hurricanes form (7) As the air rises it cools, condenses and forms towering cumulonimbus clouds. 7 of 9 How hurricanes form (8) The rapidly rising air creates an area of intense low pressure. The low pressure sucks in air, causing very strong winds. 8 of 9 How hurricanes form (9) Once the storm moves over land it starts to lose energy and fades. 9 of 9
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