What is a hurricane

How does a hurricane come about?


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How does a hurricane come about?

Fatime from Huttwill wants to know more about cyclones. Hurricanes are called cyclones in America, they are called cyclones in the Indian Ocean, typhoons in the Western Pacific and Willy-Willy in Australia. Here you can find out how they are created.

What is a hurricane
Image: The orange arrows indicate the incoming warm air, which rotates in a spiral. In the middle you can see how cooler air sinks into the eye, i.e. the center, of the hurricane.
Hurricanes (dt. Plural) or hurricanes (eng. Plural) are tropical cyclones that occur in the area of ​​the North Atlantic. They form in summer and autumn and can spread for hundreds of kilometers. "Irene" even covered an area the size of Europe on the North American Atlantic coast.

Cyclones form over tropical seas in late summer when the water temperature is at least 26 degrees Celsius. Then incredible amounts of water evaporate from the sun over the heated ocean. This steam rises and air is sucked in at the surface of the water.

The air flowing in from the sides begins to rotate. You can see the same thing when water flows into a drain. A funnel-shaped vortex is created. In the middle - the eye of the hurricane - it is perfectly calm. This eye can be 20 to 70 kilometers in diameter. Huge storms circle around this center. They can reach a speed of up to 300 kilometers per hour.

In contrast to a hurricane, a tornado does not form over the open sea, but over the mainland, in the interior of America, in the wide, flat land. The tornado is a small-scale but often devastating cyclone.

Warm air rises in a spiral under a large thundercloud. The turning movements become faster and faster, like a pirouette of a figure skater. Eventually a kind of hose becomes visible at the bottom of the cloud, which leads to the earth. A suction is created and as soon as this air hose touches the ground, it pulls up everything that comes in its way.

If the tornado weakens, it drops everything again. Tornadoes can reach speeds of up to 500 kilometers per hour and more. They are unpredictable and dangerous.

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