How are cyclones formed?

Tropical cyclones are formed only over warm ocean waters near the equator. When warm, moist air over the ocean rises upward from near the surface, a cyclone is formed. When the air rises up and away from the ocean surface, it creates an area of lower air pressure below.

How do tropical cyclones weaken?

Thus, the typhoon will dissipate once the supply of water vapor is cut-off. This is manifested when a typhoon from the ocean passes over land. While still in the water areas, the typhoon is strongest, but its strong winds will normally diminish when it is over land.

What are cyclones and how are they caused?

Cyclones are violent Storms with an intense spiral and accompanied by strong winds and heavy rains. They are caused due to strong winds blowing around the central area having low atmospheric pressure.

How are cyclones formed How are they classified?

cyclones are classified on the basis of the wind speed. Very Severe Cyclonic Storm: Very Severe Cyclonic Storms have hurricane-force winds of 73–102 mph (118–166 km/h). Extremely Severe Cyclonic Storm: Extremely Severe Cyclonic Storms have hurricane-force winds of 166–221 km/h (104–137 mph).

What are the destruction caused by cyclone?

The destruction caused by cyclones depends on its intensity, location, and size. In forest regions, the trees get uprooted and canopies get affected. In coastal regions, the banks and embankments get eroded. In deserts, the sand dunes get reshaped whereas in mountainous regions mudslides and landslides occur.

Why does a cyclone become weak on hitting the ground?

Answer: A cyclone becomes weak once it hits the land because of its friction with the land and shortage of moisture.

Which of the following weakens a tropical cyclone?

When a tropical cyclone passes over land or cold water, the basic fuel that drives the storm is cut off–warm ocean water–is cut off. Passing over land will quickly weaken the storm (not because of friction as some believe, but because of the loss of the warm moisture source).

What are the damages caused by a cyclone?

Very strong winds may damage installations, dwellings, communication systems, trees., etc. resulting in loss of life and property. Heavy and prolonged rains due to cyclones may cause river floods and submergence of low lying areas by rain causing loss of life and property.

How are cyclones formed How are they classified Class 9?

cyclones are classified on the basis of the wind speed. The lowest official classification used in the North Indian Ocean is a Depression, which has 3-minute sustained wind speeds of between 20–31 mph (31–49 km/h).

How are tropical cyclones Categorised?

A cyclone will often bring with it heavy rains that can cause flooding. In order for it to be categorised as a cyclone, its average sustained wind speed needs to exceed 63 km per hour. To be classified as severe, the average sustained wind speed needs to exceed 118 km per hour.

What happens when cyclone hits land?

When a tropical cyclone makes landfall, surface friction decreases wind speed but increases turbulence; this allows fast-moving air aloft to be transported down to the surface, thereby increasing the strength of wind gusts. There is also evidence of tropical cyclone downbursts, driven by evaporative cooling of air.

Why do tropical cyclones weaken when they hit land?

Tropical cyclones usually weaken when they hit land, because they are no longer being “fed” by the energy from the warm ocean waters. However, they often move far inland, dumping many inches of rain and causing lots of wind damage before they die out completely.

What is the wind speed of a tropical cyclone?

And when the wind speeds reach 74 mph, the storm is officially a “tropical cyclone,” or hurricane. Tropical cyclones usually weaken when they hit land, because they are no longer being “fed” by the energy from the warm ocean waters.

Where do tropical cyclones usually move?

Tropical cyclones usually move westward in the tropics, and can later move north or south into the temperate zone.Tropical cyclones are powered by warm, humid ocean air. When they go onto land, they weaken.

What is the difference between a typhoon and a cyclone?

While being referred to as typhoons in the western North Pacific region. The nomenclature in the Southern Pacific and the Indian Ocean severe tropical cyclones or simply cyclones. Tropical cyclones are compact, circular winds with a diameter of 320km. Its winds swirl around a central region that has low atmospheric pressure.