Why do typhoons occur

If the right conditions persist long enough, they can combine to produce the violent winds, large waves, torrential rains, and floods we associate with this phenomenon. At times, when a weather system does not meet all of these conditions, but is forecast to bring tropical storm or hurricane force winds to land in the next day or two, it is called a potential tropical cyclone in the Atlantic basin and the central and eastern North Pacific basins.

In the Atlantic, hurricane season officially runs from June 1 to November Ninety-seven percent of tropical cyclone activity occurs during this time period. However, there is nothing magical about these dates.

Hurricanes can and do occur outside of this six month period. As low level winds flow into the regions of such disturbances, these winds absorb moisture and energy from the ocean and rise upwards. The absorbed energy is lost in the form of heat, warming the air above the ocean. As warm air is less dense, it rises, and colder air from the surroundings is attracted into the void created by the rising warmer air.

This air again absorbs moisture and energy from the ocean, again releasing heat as it rises up. Thus, a column of warm, moist air is created above the ocean, and this is known as a tropical depression. As the resulting drop in atmospheric pressure keeps intensifying, winds with ever greater speeds are attracted to the depression, and soon a tropical cyclone may be born.

When the wind speeds at the center of such storms rise above a threshold value of kilometers per hour, the storms are then officially known as typhoons. After they are formed, these typhoons tend to travel following either one of three types of paths: a straight track, a parabolic recurving track, and a northward track, each affecting any land that falls in their paths of movement.

These tropical cyclones frequently originate in the northwestern Pacific Ocean, usually in the tropical seas around the Caroline Islands and the Philippines , and occasionally also arise from the South China Sea.

This is a tropical cyclone. When the wind speed is over 34 knots There is a chimney-like convection around the center of the typhoon, where the air travels downward. According to pictures taken from space satellites, we can see a transparent hole without clouds in the center of the gyre. This is the typhoon eye.

In the typhoon eye, a calm environment is maintained as the direction and strength of the wind cancel each other out. How do typhoons affect biodiversity? Is biodiversity lost due to floods or landslides caused by typhoons? Or, are there any other reasons that biodiversity will be lost? Direct damage caused by typhoons includes the destruction of biological species. For example, precious plants and animals are washed away or buried due to floods or landslides, and the original forms are no longer retained.

However, such natural disasters have been repeated over a long history. The answers to these questions allow scientists to make lifesaving predictions about when and where typhoons will occur.

Instead, they begin as something called a tropical wave. These regularly form in the tropics, where the sun shines directly for most of the year. Because warm air can hold water better than cool air, low-pressure systems like tropical waves are warmer and wetter than the surrounding air, and they often appear carrying clouds.

In this zone prevailing winds push westward from South America toward Asia and Australia. As the tropical wave moves westward, warm, wet ocean air is added to the wave, increasing its size.

If the sea surface under the tropical wave is at least Other conditions have to be met for the tropical wave to become a full typhoon. As this happens, thunderstorms form.

These winds are often associated with thunderstorms.