Why does the eye disappear when a typhoon weakens?

The eye of a typhoon is a small piece of sunny day in a typhoon. The eye area is usually round in shape, but it can also be oval or irregularly shaped. In the early stage of tropical cyclone development, the shape of the eye area is generally irregular and the area is large, and when the tropical cyclone develops strongly, the eye area is reduced to a circular shape and is distributed in an axisymmetric manner.

The eye area is mostly clear and cloudless, with only a few Stratocumulus clouds in the lower layers. The air pressure in the center of the eye area is the lowest, and the wind speed is also very small, which is a light breeze or a quiet wind. In the vicinity of the eyewall, the wind speed increases dramatically, reaching a maximum.

In the eye of a typhoon, many flocks of birds are often seen. So these countless seabirds, which are blown into the eye area of the typhoon by the typhoon's currents, find a safe haven and sometimes fly far away as the typhoon moves.

The formation of the eye of the typhoon is due to the fact that the wind in the typhoon blows in an anticlockwise direction, causing the central air to rotate, and the centrifugal force caused by the rotation is balanced with the wind blowing in to the center, so that the strong wind can no longer converge to the center, so that there is no wind within tens of kilometers of the typhoon center, and because of the phenomenon of air sinking and warming, the clouds and rain dissipate and become the eye of the typhoon. The eye of the typhoon is generally windless and rainless, and the pressure is high. When the typhoon weakens, the pressure difference decreases, the pressure gradient force weakens, and the peripheral updraft decreases, resulting in a decrease in the downdraft of the eye of the typhoon, which is not enough to form the atmospheric circulation system inside the typhoon, and the eye of the storm disappears automatically.

A typhoon is a large mass of rotating air with a very low central pressure, and the surrounding air rotates rapidly in a counterclockwise direction around its center. The lower level air rotates towards the center of low pressure, and the faster the air flow, the greater the wind speed.

Within a circular area with an average diameter of about 40 km at the center of a typhoon, it is commonly referred to as the eye of the typhoon. Because the air on the periphery of the eye of the typhoon rotates too much, it is not easy for the outside air to enter the central area of the typhoon under the action of centrifugal force, so the eye area of the typhoon is like an isolated tube surrounded by a wall of clouds. The air inside it is almost non-rotating, and the wind is weak.

The air outside the eye area of the typhoon swirls towards the center of low pressure, carrying a large amount of water vapor, which is not easy to enter the eye area, and rises on its periphery, forming a large gray-black bloated and towering cloud, which is pouring rain. However, there is a downdraft in the eye area of the typhoon, so the clouds and rain dissipate, and twinkling stars can be seen at night. As shown in the satellite image of Typhoon Rammasun No. 5 this year, the eye of the typhoon is generally sunny to slightly cloudy, so it appears as a small black dot on the satellite image.

But after the eye of the typhoon is removed, the weather will become extremely bad again.

In the eye of a typhoon, many flocks of birds are often seen. These countless seabirds, blown into the eye area by the typhoon's currents, find a "safe haven" and sometimes fly far away as the typhoon moves.

Although the weather was good in the eye of the typhoon, the waves at sea were very rough. This is because the pressure at the center of the typhoon is very low compared to the surrounding area. Therefore, in the place where the typhoon center makes landfall, it often causes high waves and causes a lot of damage.

1. There are two main situations for the demise of typhoons: one weakens and disappears; The second becomes an extratropical frontal cyclone. After the typhoon makes landfall, the water vapor** decreases, the energy is depleted (the power is gone), and the friction on land is much greater than that at sea due to the unevenness of the underlying surface.

In addition, the bottom air pours into the center of the typhoon, and the convergence of the bottom layer is much greater than the spread of the upper layer, which destroys the structure of the typhoon and will naturally disappear. In the process of moving, if the typhoon moves to the high latitudes, there will generally be cold air intrusion, and the interaction with the typhoon is easy to form cold and warm fronts, becoming an extratropical frontal slag cyclone, and the typhoon will become a thing of the past.

2. Typhoon (English: typhoon) is a type of tropical cyclone. A tropical cyclone is a low-pressure vortex that occurs over the tropical or subtropical ocean, and is a powerful and deep "tropical weather system".

In China, tropical cyclones in the South China Sea and the Northwest Pacific Ocean are classified into six categories according to the maximum average wind speed (wind speed) near the center of the bottom layer, among which those with winds of 12 or above are collectively referred to as typhoons.

Hello, for you to inquire: 1. Reducing sea water temperature is an important factor in the formation and maintenance of typhoons, generally speaking, sea water temperature needs to reach Celsius or above in order to provide enough heat and water vapor for typhoons. If a typhoon moves to an area with lower sea temperatures, or if the sea temperature drops due to seasonal changes and ocean circulation, the typhoon loses energy** and gradually weakens and dissipates.

Rougha. 2. Changes in atmospheric circulationAtmospheric circulation is also an important factor in the formation and maintenance of typhoons, and generally speaking, typhoons need to develop in a low-pressure system and be guided and supported by the upper-air jet stream. If a typhoon moves into a high-pressure system, or if the upper-air jet stream changes or disappears due to seasonal changes and climate anomalies, then the typhoon is hindered and disturbed, gradually weakening and dissipating. 3. Land friction resistanceLand friction resistance is also an important factor for the weakening and disappearance of typhoons, generally speaking, typhoons are subject to less frictional resistance when moving over the sea rock, and more frictional resistance when moving on land.

If a typhoon makes landfall or is close to land, it will be affected by the friction of mountains, forests, buildings, etc. on land, causing its wind speed to drop and its structure to be damaged, and gradually weaken and dissipate. <>

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The details are as follows:

1. Geostrophic deflection force: due to the rotation of the earth, the force perpendicular to the direction of motion of the moving object on the earth, the magnitude of the force is related to the speed of the object, the dimension in which it is located, etc., and the geostrophic deflection force is the visual force, which only changes the direction of motion of the object without changing the speed of motion. In the Northern Hemisphere, the geostrophic deflection force in the horizontal direction is always directed to the right perpendicular to the direction of motion of the object.

2. Geostrophic wind: the horizontal pressure gradient force and the horizontal geostrophic deflection force are balanced so that the direction of atmospheric movement is parallel to the isobar. It's an ideal state of wind.

3. Cyclone: a vortex formed in the area of low pressure with counterclockwise rotation of the atmosphere under the joint judgment of the pressure gradient force and the geostrophic deflection force. There is a strong updraft at the center of the cyclone.

Typhoons are essentially powerful cyclones with tropical disturbances that develop into Daichirai. However, unlike extratropical cyclones, typhoons generally have stronger energy and stronger updrafts.