How do typhoons form?

Typhoon refers to the tropical cyclone formed on the vast sea surface above 26℃ in the tropics or subtropics. In the past, our country used to call the tropical cyclone formed on the tropical ocean surface above 26℃ as typhoon. According to its intensity, it is divided into six grades: tropical depression, tropical storm, strong tropical storm, typhoon, strong typhoon and super typhoon. Let's take a look at how typhoon is formed!

How do typhoons form?

Typhoons originate in tropical seas, where temperatures are high and large amounts of sea water evaporate into the air, creating a low pressure center. As the pressure changes and the earth itself moves, the incoming air also rotates, forming a counterclockwise swirling air vortex, which is a tropical cyclone. As long as the temperature does not drop, this tropical cyclone will become stronger and stronger, and eventually form a typhoon.

What are the benefits of typhoons?

1. Typhoon brings abundant fresh water to people. The typhoon brought heavy rainfall to the coasts of China, the Sea of Japan, India, Southeast Asia and the southeastern United States.

2. Tropical and subtropical areas near the equator are subject to the longest sunshine hours and are hot and unbearable. If there is no typhoon to disperse the heat in these areas, it will be hotter there, the sand shortage on the surface will be more serious, and the cold zone will be colder. The temperate zone will disappear. There will be no spring city like Kunming in China, and there will be no Guangzhou with evergreen seasons. The "North Dacang" and Inner Mongolia grassland will no longer exist.

3. The maximum speed of typhoon can reach more than 200 kilometers per hour. Wherever it goes, it will be destroyed. This huge energy can directly cause disaster to mankind, but it also keeps the earth in thermal balance by virtue of this huge energy flow, so that mankind can live and work in peace and contentment.

Typhoons can also increase fishing output. When typhoons blow, they roll up the nutrients at the bottom of the river and sea, increase the number of bait, attract fish to gather near the water surface, and naturally increase the catch.

What harm does typhoon have?

1. The strong wind weather brought by typhoon is one of the main hazards of typhoon, especially the strong wind near the center of typhoon. The following paragraph of text will give us an image of the concept of understanding the harm of strong wind, six difficult to walk umbrella, seven inconvenient to walk against the wind, eight wind branches broken, nine roof tiles flying, ten uprooted trees, falling objects, dilapidated buildings collapse and so on are typhoon days easy to occur accidents.

2. Typhoon influence is accompanied by rainstorm most of the time, even heavy rainstorm or extremely heavy rainstorm. Torrential rain is easy to cause floods, resulting in flooding of villages, houses, ships, bridges, amusement facilities, etc., or even destruction, resulting in loss of life and property. Heavy rain may cause damage to water conservancy projects and cause serious danger. Heavy rain may also trigger landslides, debris flows and other geological disasters, causing casualties.

3. Storm surge is easy to wash away seawall dikes, culverts and docks. Revetments and other facilities can cause seawall crevasse, seawater backflow, and even directly wash away nearby personnel, causing casualties.

4. Typhoon transit often brings stormy weather, causing huge waves on the sea surface, seriously threatening navigation safety. Storm flooding after typhoon landfall may destroy crops, various buildings and facilities, resulting in huge losses of people's lives and property.

Typhoon life cycle

1, gestation stage: the sun after a day of irradiation, the sea formed a strong cumulonimbus clouds, these cumulonimbus clouds in the hot air rise, the surrounding cooler air constantly supplemented, rise again when heated, so that the cycle, so that the air above hot, cold air below, the hot air above the evaporation of water vapor expanded the scope of the cloud belt, the expansion of the cloud belt makes this movement more intense. The expanding cloud cluster is affected by geostrophic deflection force and rotates counterclockwise to form a tropical cyclone. The centrifugal force generated by the rotating air in the tropical cyclone throws the air outward. The air in the center becomes thinner and thinner, and the air pressure becomes smaller and smaller, forming a tropical depression-the initial stage of typhoon.

2. Development stage: the central pressure of tropical depression is lower than that of the outside world, so the surrounding air flows to the tropical depression and rises in heat, supplying more energy to the tropical depression and exceeding the output energy. At this time, the air in the tropical depression rotates more violently, the maximum wind in the center rises, and the central pressure is further reduced. When the maximum wind near the center reaches a certain standard, it will be upgraded to a higher level, tropical depression to tropical storm, then to severe tropical storm, typhoon, sometimes to strong typhoon or even super typhoon.

3, mature stage: the size of the typhoon depends on the energy input and output ratio, the input energy is greater than the output energy, the typhoon will be strengthened, and vice versa will be weakened. Typhoons have developed over a long period of time and become powerful enough to cause disasters. If they make landfall at this time, they will cause great damage.

4. Death stage: There are two paths for typhoon to die out. The first one is: after typhoon lands on land, it will be rapidly weakened and died out due to the joint influence of ground friction and insufficient energy supply. The residual cloud system after death can bring long-term heavy rainfall to a certain place. The second one is: Typhoon turns in the north of the East China Sea, after landing in Korea or passing through the Korean Strait, it changes to extratropical cyclone in the Sea of Japan, and dies slowly after changing to extratropical cyclone.