Tropical Cyclones

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  • Tropical Cyclones
    • Structure
      • above the tropical cyclone is a dense canopy of cirrus clouds
      • Rain bands swirl around the centre
      • the centre is called the eye
        • clear skies and no wind - very high air pressure
      • the eye wall surrounds the eye
        • often contains strongest winds and heaviest rainfall
    • Formation
      • form in tropical areas
      • high temperatures
      • rising air causes the thunderstorms
      • conditions
        • 26.5°c water temp
        • at the warmest time of year
        • winds converging at ocean surface
        • away from equator so Coriolis effect can cause storm to rotate
      • sometimes the storms join together to make a strong flow of warm, rapidly rising air
    • Why do they spin?
      • the strong winds are caused by air rushing from high to low pressures
      • spin by Coriolis effect
        • rushing winds are deflected into a spin by the Northern Hemisphere
      • N.H spin counter-clockwise and S.H spin clockwise
    • Areas and Tracks
      • the area that its formed is called source area
        • they have the triggers for a cyclone eg. hot water
      • they have seasonal distribution
      • they move away from their source and in the direction of the prevailing winds
      • the way it travels is called a track
    • What they are
      • large scale, rotating storms
      • hurricane, cyclone, typhoon
        • depends on where in the world they land


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