Which country has drawn up the international wind rating?

The wind level was first recorded in the Tang Dynasty of our country, and the international wind level should be determined by the United Nations, which should be common to our country's wind level, or can be converted, just like one or two = 10g, one catty = 500g.

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Wind force refers to the amount of force that the wind exhibits when it hits an object. Generally, according to the various phenomena caused by the wind blowing on the ground or water surface, the magnitude of the wind force is divided into 18 levels, the minimum is 0, and the maximum is 17.

Wind speed is the forward speed of the wind. The greater the pressure difference between two adjacent places, the faster the air flow and the greater the wind speed, the greater the wind force. Therefore, the magnitude of the wind is usually expressed in terms of wind force.

The unit of wind speed is expressed in how many meters per second or how many kilometers per hour. When issuing weather forecasts, most of them use wind ratings.

The magnitude of the wind speed is often expressed in terms of the number of winds. The level of wind is determined based on the degree of influence of the wind on objects on the ground. In meteorology, it is generally divided into twelve levels according to the magnitude of the wind:

Level 0 wind is also called no wind.

Level 2 wind is called light breeze, and the leaves are slightly sounding, and the human face feels windy.

The level 4 wind is called the Japanese wind, and the twigs of the tree shake and can blow up dust and paper on the ground.

The level 6 wind is called a strong wind, the branches of large trees are shaking, the power lines are whirring, and it is difficult to walk with an umbrella.

Category 8 winds are called gales, and the branches of trees can be broken, and it is very difficult for people to walk in the wind.

Category 10 winds are called squalls, which are rare on land, and can uproot trees, causing serious damage to buildings.

Winds above level 12 are called typhoons or hurricanes, which are extremely destructive and rare on land.

In weather forecasting, it is common to hear terms such as "north wind force 4 to 5", in which case the wind refers to the average wind force; If you hear a phrase such as "gust of 7", the gust refers to the wind speed fluctuates, and the wind force in this case refers to the wind force at the maximum.

The symbol for wind direction and wind force is represented by a wind vector, which consists of a wind direction stalk and a wind plume.

The symbols for winds of magnitude 1-2 are 1 vertical bar and 1 horizontal; The symbols for the 3-4 winds are 1 vertical bar and 2 horizontal; The symbols for 5-6 winds are 1 vertical bar and 3 horizontal; The symbols for the 7-8 winds are 1 vertical bar and 4 horizontal; The symbol for winds above level 8 is 1 vertical bar and 1 triangle, like a small flag.

The wind ratings are as follows:

The wind is a soft wind, the wind speed is m s, the cooking smoke indicates the direction of the wind, the sea surface is characterized by microwave peaks without droplets, and the wave height is;

The wind is a light wind, the wind speed is there, the human body can feel the wind, the sea surface is characterized by small crests are not broken, and the wave height is meters;

The wind is a light breeze, the wind speed is there, the flag will flutter with the wind, and the sea surface will show a small wave peak breaking, and the wave height is meters.

1. Brother 1 (km h): 1-5.

Level (km h): 6-11.

Level (km h): 12-19.

Grade (km h): 20-28.

Class (km h): 29-38.

Level (km h): 39-49.

Level (km h): 50-61.

Level (km h): 62-74.

Level (km h): 75-88.

Class (km h): 89-102.

Grade (km h): 103-117. Attack.

Grade (km h): 117-134.

Grade (km h): 134-149.

Grade (km h): 150-166.

Grade (km h): 167-183.

Level (km h): 184-201.

Level (km h): 202-220.

Above grade (km h): 221.

19. Super typhoon (km h): 250.