why do cyclones occur?

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Answer by Kid who has to do an assignment
Submitted on 9/28/2004
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As described in Subject G1, the primary time of year for getting tropical cyclones is during the summer and autumn: July-October for the Northern Hemisphere and December-March for the Southern Hemisphere (though there are differences from basin to basin). The peak in summer/autumn is due to having all of the necessary ingredients become most fa vorable during this time of year: warm ocean waters (at least 26�C or 80�F), a tropical atmosphere that can quite easily kick off convection (i.e. thunderstorms), low vertical shear in the troposphere, and a substantial amount of large-scale spin available (either through the monsoon trough or easterly waves). While one would intuitively expect tropical cyclones to peak right at the time of maximum solar radiation (late June for the tropical Northern Hemisphere and late December for the tropical Southern Hemisphere), it takes several more weeks for the oceans to reach their warmest temperatures. The atmospheric circulation in the tropics also reaches its most pronounced (and favorable for tropical cyclones) at the same time. This time lag of the tropical ocean and atmospheric circulation is analogous to the daily cycle of surface air temperatures - they are warmest in mid-afternoon, yet the sun's incident radiation peaks at noon

Answer by chrissy
Submitted on 4/2/2006
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When warm air rises from the seas and condenses into clouds, massive amounts of heat are released. The result of this mixture of heat and moisture is often a collection of thunderstorms, from which a tropical storm can develop. The trigger for most Atlantic hurricanes is an easterly wave, a band of low pressure moving westwards, which may have begun as an African thunderstorm. Vigorous thunderstorms and high winds combine to create a cluster of thunderstorms which can become the seedling for a tropical storm. Typhoons in the Far East and Cyclones in the Indian Ocean often develop from a thunderstorm in the equatorial trough. During the hurricane season, the Coriolis effect of the Earth's rotation starts the winds in the thunderstorm spinning in a circular motion.

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Question by me
Submitted on 3/18/2004
Related FAQ: FAQ: HURRICANES, TYPHOONS AND TROPICAL CYCLONES (Part 1 of 2)
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why do cyclones occur?

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Submitted on 3/28/2004
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Submitted on 8/22/2004
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a rare but natural activity in the sky that causes terrentrial rain and severe damage tov human property and life

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Submitted on 8/30/2004
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Answer by e=mc2
Submitted on 9/3/2004
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cyclones oiccur due to Cyclones develop over warm seas near the Equator. Air heated by the sun rises very swiftly, which creates areas of very low pressure. As the warm air rises, it becomes loaded with moisture which condenses into massive thunderclouds. Cool air rushes in to fill the void that is left, but because of the constant turning of the Earth on its axis, the air is bent inwards and then spirals upwards with great force. The swirling winds rotate faster and faster, forming a huge circle which can be up to 2,000 km across. At the centre of the storm is a calm, cloudless area called the eye, where there is no rain, and the winds are fairly light.

Answer by Cycloner
Submitted on 9/28/2004
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Cyclones occur because of low pressure systems which get heat from the warm water which has to be 27 degrees or above and the sun heats the water up and makes it evaporates which heat up the atmosphere quickly which makes the cyclone build up. Cyclones start about 5 to 15 degrees latitude of the equator.

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Answer by 203.173.fakeiP
Submitted on 3/11/2006
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Cyclones develop over warm seas near the Equator. Air heated by the sun rises very swiftly, which creates areas of very low pressure. As the warm air rises, it becomes loaded with moisture which condenses into massive thunderclouds. Cool air rushes in to fill the void that is left, but because of the constant turning of the Earth on its axis, the air is bent inwards and then spirals upwards with great force. The swirling winds rotate faster and faster, forming a huge circle which can be up to 2,000 km across. At the centre of the storm is a calm, cloudless area called the eye, where there is no rain, and the winds are fairly light.

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