Friday, 10 May 2013

Formation of tropical revolving storms

1) Tropical revolving storms are huge spinning storms with strong winds and torrential rain.
2) They develop over warm water. As warm moist air rises and condenses, it releases energy that increases wind speed. 
3) The conditions needed are as follows:
    • A disturbance near the sea surface that triggers the storm (e.g. an area of low pressure)
    • Warm and deep sea water (26.5'c to at least 50m below the surface)
    • Convergence of air in the lower atmosphere, either within the trade belt and ITCZ or along the boundary between warm and cold air masses. This forces air to rise
    • A location at least 5' from the equator. This is because the Coriolis effect isn't strong enough to make them spin  
4) TRS lose strength when they move over land as their supply of warm moist air is cut off.
5) They move away from the equator because of the Coriolis effect. 
6) Move in an anti-clockwise direction.
7) Strongest winds on the eye wall, with the weakest winds found in the eye.

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