Summary: Geography: Year 10

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• 1 Geography: Year 10

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• What are the causes of a tropical storm?

  They form in tropical waters near the equator where they get direct sunlight. when hot/ wet air rises, cimulo-nimbus clouds and rainfall are formed. It also creates a low-pressure zone near the surface of the water. Low-pressure sucks in air from the surroundings which then rises

• describe the structure of a tropical storm.

  The main parts of a tropical storm are the rainbands, the eye, and the eyewall. Air spirals in toward the center in a counter-clockwise pattern in the northern hemisphere (clockwise in the southern hemisphere), and out the top in the opposite direction.

• What way do tropical storms spin in the Southern Hemisphere?

  a clockwise pattern

• Where do tropical storms usually occur?

  They occur roughly between the tropics of Cancer and Capricorn. Some storms can form just outside of the tropics, but in general, the distribution (location) of these storms is controlled by the places where sea temperatures rise above 27°C.

• describe what the eye of the tropical storm is

  in the center is the eye of the hurricane.  Often there will be no clouds in the eye. Seen from below it will seem calmer, with a circle of blue sky above. The eye is formed because this is the only part of the hurricane where cold air is descending.

• Describe what the eye wall is

  Surrounding the eye is a stormy eyewall, formed as inward-moving, the warm air turns upward into the storm. Usually, the strongest winds are found in this area.

• Describe what a rainband is

  Rainbands within tropical cyclones are curved in orientation. Tropical cyclone rainbands contain showers and thunderstorms that, together with the eyewall and the eye, constitute a hurricane or tropical storm.

• What is Global Atmospheric Circulation?

  The worldwide system of winds, which transports heat from the tropical (equator) to polar latitudes (north and south poles).

• What is the Hadley cell?

  At the equator, there is an area of low pressure, due to the rising and expanding air. At around 30º North the sinking air creates an area of high pressure. As air is heated it expands and rises, leaving low pressure.

• What is the Ferrel cell?

  The Ferrel cell is found between the Hadley and Polar cells and lies between 60º North and 30º North. The Ferrel cell is thermally indirect as it is powered by the other two cells. In reality, the effect of jet streams disrupts the Ferrel cell.