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Hurricanes & Tropical depressions 2011 cloutier
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  • 1. Hurricanes & Tropical Depressions by Annie Cloutier 2011 copyright
  • 2. What do we need to make a hurricane ?
  • 3. Most likely time of year to happen ?
    • June – November 30: Atlantic Ocean, but most hurricanes form from late August to November
    • May – November : Pacific Ocean
  • 4. Yes, just when school starts up
  • 5. Cyclones or a Typhoon
    • Cyclones
    • Spiral inwards
    • Typhoon
    • Mike in the Philippines
  • 6. Depending on what your location is around the world…
    • Hurricanes happen in the North Atlantic, Northeast Pacific Ocean east of the dateline or, South Pacific Ocean east of 160 * east longitude
    • Tropical cyclones happen in the Southwest Indian ocean
    • Typhoons happen in the Northwest Pacific Ocean west of the dateline
    • Severe tropical cyclones happen in the North Indian ocean
  • 7. Map of world severe weather
  • 8. Force categories of hurricanes
  • 9. Why do hurricanes move in the opposite direction of how the Coriolis Effect makes the atmosphere move normally ?
    • Imagine a record player spinning and you trying to jump on it.
    • What happens ?
    • You get spun around in the opposite direction to counter the force of right movement in the Northern Hemisphere:
    • the Southern Hemisphere the left movement or reverse direction
    • The extreme force of the winds give an equal and opposite reaction push in the opposite direction than the Coriolis direction.
  • 10. Dog tries to demonstrate effect
  • 11. Cyclone Anticyclone
    • Low pressure areas are called cyclones
    • Pressure pushes air inward
    • The same deflection inward moving air in a low pressure cyclonic system causes a counterclockwise rotation
    • High pressure regions are called anticyclones
    • Pressure pushes air outward
    • In the Northern hemisphere, the rightward deflection of the outer moving air causes the high pressure anticyclone system to rotate in a clockwise direction
  • 12. Low pressure High pressure
  • 13. Hurricane, typhoon, cyclones are all are LOW PRESSURE systems
    • The terms hurricane, typhoon and cyclone are regionally specific terms depending on the location on Earth where the storm occurs.
    • Deflection on an inward moving air mass in low pressure cyclonic systems causes a counterclockwise rotation
    • In the Northern hemisphere the rightward deflection of the outward moving air causes a high pressure anticyclonic weather system to rotate clockwise.
  • 14. Doppler effect- changes in the wave frequency that occurs in energy when that energy moves towards or away from an observer
  • 15. The end