How are the grades of wind classified?

Wind power refers to the strength of the wind blowing on an object. Generally speaking, according to various phenomena caused by wind blowing on objects on the ground or water surface, the magnitude of wind power is divided into 18, with the smallest being 0 and the largest being 17.

Wind speed is the forward speed of the wind. The greater the air pressure difference between two adjacent places, the faster the air flow, the greater the wind speed and the greater the wind force. Therefore, the magnitude of wind is usually expressed by wind power. The unit of wind speed is meters per second or kilometers per hour. When the weather forecast is released, the wind level is mostly used.

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 strong wind, the twigs of trees can be broken, and people walk against 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, which are extremely destructive and rarely seen on land.

In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the expression "gust 7", gust refers to the wind with high and low wind speed, and the wind at this time refers to the maximum wind force.