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Because the gas expands and contracts in the heat, the temperature in the tropics is relatively high, and the gas rises, forming a low pressure near the ground. This phenomenon is on a large tropical scale, and typhoons are on a relatively small scale.
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A tropical depression is a type of tropical cyclone. It is the weakest tropical cyclone.
Winds with winds of more than 17 meters near the center of a "tropical depression" are called "typhoons". Therefore, typhoons are also a type of tropical depression. A tropical depression is also called a "tropical cyclone".
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A tropical depression is a type of tropical cyclone and belongs to the weakest class of tropical cyclones. It is only possible to develop into a typhoon if it continues to strengthen and develop into a tropical storm, so the tropical depression is the "juvenile stage" of a typhoon. The storm area of a typhoon must be 15 meters per second or above and the area of the engine room, and there must be strong winds in the typhoon, coupled with the development of large cumulonimbus clouds that can fall heavy rain, so the typhoon area will cause disasters in addition to heavy rainfall.
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Below 8 is called a tropical depression 8-9 is called a tropical storm 10-11 is called a severe tropical storm 12-13 is called a typhoon 14-15 is called a strong typhoon 16 or more is called a super typhoon - from the comparison in the table above, you will know.
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The two are mutually influencing different typhoon paths correspond to different subtropical high (subtropical high) situations, there is no damage but there is an impact, and the typhoon strengthens when the subtropical high weakens, and the typhoon weakens when the subtropical high weakens.
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The tropical depression is actually the primary state of the typhoon, which means that the tropical depression is only possible if there is a tropical depression next to the hunger.
Normally, when a tropical depression is upgraded to tropical storm level, it will be named and numbered, and it will be a real typhoon. Tropical storm is the second level of typhoon, and typhoons are mainly divided into 6 levels, namely tropical depression, tropical storm, severe tropical storm, typhoon, limb strong typhoon, and super typhoon.
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Tropical depression is a species of tropical cyclone, which belongs to the weakest level of tropical cyclone intensity, and the maximum wind speed and wind force of 6-7 according to the international regulations are called tropical depressions. Typhoons are also a type of tropical cyclones, and China's meteorological department stipulates that tropical cyclones with a maximum wind speed of 12 or more near the ground center are collectively referred to as typhoons.
The tropical depression is composed of many upward-developing, strong convective clouds, which are so-called "tropical disturbances" formed by clouds that develop in areas of air instability over the tropical oceans. It has the characteristics of heart-warming properties, circulation center, convective clouds, vortex wind and rain areas, and has imitation of its movement path.
Broadly speaking, tropical cyclones with sustained winds of metres per second or more at their centres, including tropical storms, severe tropical storms and typhoons, are referred to as typhoons.
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