What is the classification standard of wind power grade?

The magnitude of wind speed is often expressed by several winds. The level of wind is determined according to the degree of influence of wind on ground objects. In meteorology, generally according to the size of the wind is divided into twelve levels:

Level 0 wind is also called no wind.

Level 2 wind is called breeze, the leaves are slightly noisy, and people feel windy.

Level 4 wind is called breeze, and the twigs of trees shake, which can blow up dust and paper on the ground.

The 6-level wind is called strong wind, the branches are shaking, the wires are whistling, and it is difficult to walk with an umbrella.

The 8-level wind is called gale, the twigs of trees can be broken, and people walk in the wind with great resistance.

10 wind is called gale, which is rare on land. Trees can be pulled up and buildings are seriously damaged.

Winds above 12 are called typhoons or hurricanes (typhoons in the Pacific Ocean), which are extremely destructive and rarely seen on land.

In fact, in nature, the wind sometimes exceeds 12. For example, the central wind force of a strong typhoon or tornado may be much larger than the magnitude of 12, but the wind above the magnitude of 12 is rare, so the magnitude is generally not specified.

The historical origin of wind measurement;

In the Tang Dynasty more than 1000 years ago, our people not only recorded weather phenomena such as rain and snow, but also measured the wind. At the beginning of the Tang dynasty, an accurate instrument for measuring wind speed was not invented, but at that time, the moving speed of wind could be calculated according to the characteristics of wind to objects, and the wind grade could be determined.

At that time, there was a man named beaufort in England. He carefully observed the situation of various objects on land and at sea in different winds, and accumulated 50 years of experience before he divided the wind into 13 in 1805, which is also commonly known as Beaufort wind scale.

Later, after research and supplement, the original explanation was explained more clearly, and the speed of each wind level was increased, which became the "jargon" for forecasting wind power.

Refer to the above? Baidu Encyclopedia-Level of Wind