The formation of a Tropical Revolving Storm

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Tropical revolving storms are slow-moving systems of extreme low pressure. They are known as Hurricanes in the western North Atlantic, central and eastern North Pacific, Caribbean Sea and Gulf of Mexico. They are referred to as cyclones in the Bay of Bengal and Arabian Sea (where they hit south Asia i.e. India and North East Africa i.e. Somalia). They are called Typhoons in  the western North Pacific (where they hit countries such as Japan, China, The Phillipines and Indonesia).

Tropical storms occur when the sea water is over 27 degrees C and the water must be over 50m deep. Tropical storms occur during the hottest times of the year, so between June and December in the northern hempishere and January to March in the southern hempishere. This is a period when the sea water gets sufficiently warmed. The warm, less dense air rises forming Cumulonimbus cloud as it reaches the top of the Troposphere which is cold, it cools, becomes more dense and falls back as precipitation. This creates a low pressure zone at the surface of the water.

Rising warm air causes the pressure to decrease at higher altitudes. Warm air is under a higher pressure than cold air, so moves towards the ‘space’ occupied by the colder, lower pressure, air…


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