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In the middle of the eye of a hurricane the wind speed is:
  • A
    higher than 63 knots and the air is ascending.
  • B
    lower than 63 knots and the air is ascending.
  • C
    lower than 63 knots and the air is descending.
  • D
    higher than 63 knots and the air is descending.

Refer to figure.

TROPICAL REVOLVING STORMS (TRS). Are thermal depressions that develop over warm tropical oceans (wind speeds in excess of 33 kts). When they sustain wind speeds greater than 63 kt, they are designated tropical cyclones. TRS generate their power and energy from the release of large amounts of latent heat from moisture they have gained over the warm seas.
THE EYE is found in the centre of the storm and, typically, has a diameter of 30-50 km (10-20 NM). Within the eye, the lowest surface pressures and calmest conditions are found. It can be well seen by weather satellites (as you can observe in the attached figure)

  • Air is forced up and outwards from the storm. Some of this air returns down the centre which causes adiabatic heating, evaporating clouds => clear column of air which distinguishes the eye.
  • The air descending in the eye is dry and warms up at the DALR, which causes the air in the eye to be warmer than the air in the eye wall.

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