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Hurricanes

Hurricanes. Chapter 13.3. Objectives. The conditions required for tropical cyclone development The life cycle of a tropical cyclone The dangers of tropical cyclones. Cyclone . Tropical cyclone Large, rotating, LOW pressure tropical storm. A.K.A.

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Hurricanes

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  1. Hurricanes Chapter 13.3

  2. Objectives • The conditions required for tropical cyclone development • The life cycle of a tropical cyclone • The dangers of tropical cyclones

  3. Cyclone • Tropical cyclone • Large, rotating, LOW pressure tropical storm

  4. A.K.A • Tropical Cyclones have different names depending on where they form • Pacific Ocean: Typhoon • Indian Ocean: Cyclone • Atlantic Ocean: Hurricane

  5. Requirements for Cyclone Formation • 1. Abundant supply of warm ocean water • 2. Mechanism to lift the warm air • 3. Minimum wind shear

  6. 1st stage of formation • Formative stage – moving tropical disturbance • Less dense, moist air rises • Rainfall and air circulation • As air moves to replace low pressure area, coriolis effect takes place • Produces a counter-clockwise rotation of the air • Known as tropical depression (less than 38 mph)

  7. 2nd stage of formation • Mature stage • moving air approaches center, more condensation • more energy • Air pressure in center continues to drop • Wind speed increases • 39 to 73 mph • Tropical storm

  8. Mature stage When a tropical storm intensifies with winds greater than 73 mph it becomes a hurricane • Eye • Center of storm • Calm and sunny • Eyewall: surrounds the eye • Strong winds and dense clouds on the edge of the eye

  9. 3rd stage of formation • Dissipation stage • Moved over land – friction • Moved over cold water • No longer has warm air at the surface to feed it

  10. Tropical cyclone movement • Move according to wind currents which steer them • Caught up in the high pressure systems that are present in the tropics • Move west and become caught up in the westerlies • React with mid-latitude systems • Interaction with many systems make their path unpredictable

  11. Saffir-Simpson Hurricane Scale

  12. Hurricane hazards • Damage • Mostly caused by high winds • Storm surge • Hurricane force winds carry a mound of ocean water toward shore

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