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How does cyclones occur?

The formation of a cyclone has a number of stages:

Stage 0 (Zero)-

The right place and the right sea temperature is needed.

The place is usually within + or - 5° to °15 Lattitude from the equator over the ocean.

The surface temperature of the ocean/sea needs to be 26.5°C or above.

A low airpressure system (depression) with convection currents starts to gather clouds/stormy
Stage I

 It is linked with a low air pressure system that starts to pull clouds in and rotate.

Stage II

 It is at the stage when the clouds start to really rotate but there is sometimes a chance that it may not develop in to a full cyclone.

TROPICAL CYCLONES ARE intense, spinning storm systems, with low-pressure centres that can be vast in size. They form over warm oceans and can wreak havoc when they approach the shore.

As the names suggests, tropical cyclones and hurricanes occur in the world's tropics. They require the difference in speed of rotation of the Earth at different latitudes to gather momentum as they spin, and they can form either side of the equator.
A tropical cyclone needs two main ingredients: a cluster of thunderstorms and a warm body of water –  at least 27ºC – from which the storm gathers its energy. The warm, tropical ocean under a developing storm evaporates then condenses to form clouds, releasing heat throughout the process.

The heat energy combined with the rotation of the Earth, gets the cyclone spinning and propels it forward. While the cyclone looks savage from the outside, its low-pressure centre, commonly known as the eye, is deceptively calm. This belies the danger of the dense wall of cloud that surrounds it, which is the deadliest part of a cyclone.

Here the strongest winds and greatest rainfall are found.The eye is usually 40 km in diameter, but can range in size from less than 10 km to over 100 km .


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