What is the highest level of typhoon?

The highest level of typhoon is super typhoon, with maximum wind speed ≥ 16 (≥5 1.0m/s).

In the past, China used to call the tropical cyclone formed on the tropical ocean surface above 26℃ a typhoon. According to its intensity, it is divided into six grades: tropical depression, tropical storm, strong tropical storm, typhoon, strong typhoon and super typhoon. Since 1989, China has adopted the international tropical cyclone name and classification standard.

According to international practice, the maximum wind force near its center is divided into:

Tropical depression with maximum wind speed of 6-7, (10.8- 17. 1 m/s); ?

Tropical storm with maximum wind speed of 8-9 (17.2-24.4m/s);

Strong tropical storm, maximum wind speed 10 ~ 1 1, (24.5 ~ 32.6m/s);

Typhoon (ty-typhoon), maximum wind speed 12 ~ 13, (32.7m/s ~ 41.4m/s);

Strong typhoon with maximum wind speed14 ~15 (41.5m/s ~ 50.9m/s);

Super typhoon with maximum wind speed ≥ 16 (≥5 1.0m/s).

Formation of typhoon:

Typhoon originated in tropical ocean, where the temperature is high and a large amount of seawater is evaporated into the air, forming a low pressure center. With the change of air pressure and the movement of the earth itself, the inflow of air also rotates, forming a counterclockwise air vortex, which is a tropical cyclone. As long as the temperature does not drop, this tropical cyclone will get stronger and stronger, and finally a typhoon will form.

Typhoon warning: blue, yellow, orange and red respectively.

The blue warning signal of typhoon indicates that it may be or has been affected by tropical cyclones within 24 hours, and the average wind force along the coast or land is above 6, or the gust is above 8 and may continue.

The yellow warning signal of typhoon indicates that it may or has been affected by tropical cyclones within 24 hours, and the average wind force along the coast or land is above 8, or the gust is above 10 and may continue.

The orange warning signal of typhoon indicates that it may be or has been affected by tropical cyclones within 12 hours, and the average coastal or land wind force is above 10, or the gust is above 12 and may continue.

Typhoon red warning signal indicates that it may or may have been affected by tropical cyclones within 6 hours, with the average wind force along the coast or land reaching more than 12, or the gust reaching more than 14, and it may continue.

Advantages and disadvantages of typhoons:

The benefits of typhoons:

First of all, typhoons bring people abundant fresh water. Typhoon brought a lot of rainfall to the coast of China, the coast of the Sea of Japan, India, Southeast Asia and the southeastern United States.

Secondly, the tropical and subtropical areas near the equator have the longest sunshine time, and the dry heat is unbearable. If there is no typhoon to dissipate heat in these areas, it will be hotter there and the surface sand shortage will be more serious. At the same time, the cold zone will be colder and the temperate zone will disappear.

Third, the typhoon can reach a top speed of more than 200 kilometers per hour, and it is invincible wherever it goes. This huge energy can directly cause disasters to mankind, but it also keeps the earth in thermal balance and makes mankind live and work in peace and contentment.

Fourth, typhoons can also increase fishing output. Every time a typhoon blows, it turns over the river, rolling up the nutrients in the river bottom and the sea, increasing the bait, attracting fish to gather near the water surface, and naturally increasing the catch.

In addition to bringing serious disasters such as storms to the landing areas, typhoons also have certain benefits.

According to statistics, the typhoon rainfall in Southeast Asian countries, including China and the United States, accounts for more than 1/4 of the total rainfall in these areas, so without typhoons, the agricultural difficulties in these countries would be unimaginable; In addition, typhoons play an important role in regulating the earth's heat and maintaining the heat balance. As we all know, tropical areas receive the most solar radiation heat, so the climate is also the hottest, while cold areas are just the opposite. Due to the activity of typhoon, the heat in tropical areas is dispersed to high latitudes, which compensates the heat in cold areas. If there is no typhoon, the climate in tropical areas will get hotter and hotter, while in cold areas it will get colder and colder, and the temperate zone on the natural earth will no longer exist, and many animals and plants will become extinct because it is difficult to adapt. This will be a very terrible scene.

Typhoon disaster:

Typhoon is a very destructive and disastrous weather system, but sometimes it can also play a beneficial role in eliminating drought. Its harmfulness mainly includes three aspects:

(1) Strong wind. The maximum wind force near the center of tropical cyclone reaching typhoon level is above 12.

② Heavy rain. Typhoon is one of the weather systems that bring heavy rain. In the area it passes through, it may produce rainfall of 150 mm ~ 300 mm, and a few typhoons can directly or indirectly produce heavy rain above1000 mm.

③ Storm surge. Generally, typhoons will increase water in coastal waters, and the maximum water increase in coastal areas of Jiangsu Province can reach 3m. Typhoon "9608" and "97 1 1" increased water, which made Jiangsu's coastal areas along the Yangtze River have a super-historical climax.

Typhoon often brings stormy weather when crossing the border, causing huge waves on the sea surface, which seriously threatens the safety of navigation. After the typhoon landed, the storm surge may destroy crops and various building facilities, causing great losses to people's lives and property.