The first to twelfth winds jingle.

First-class light smoke deviates with the wind; The second breeze blows the face; Three-level moving leaf red flag exhibition; Four-stage branch flying paper; Five-level small trees sway in the wind.

Level 6 is difficult to carry an umbrella; It is inconvenient to walk in the wind in the seventh grade; Eight winds blow off branches; Nine-level roof flying tiles; Ten-level uprooting trees and toppling houses; Eleven or two grades are rare.

Extended data

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 releasing the weather forecast, most of them use the wind level. How to determine the series of wind power?

The distance that the wind moves per second-the wind speed, its formula is "from all the way to nine, multiplied by two". It means: from 1 to 9 winds, multiply each level by 2, and you can roughly get the maximum wind speed.

For example, the maximum speed of the first wind is 2 meters per second, the second wind is 4 meters per second, the third wind is 6 meters per second, and so on. There are also transitional figures between different levels of wind, such as the first level wind 1-2 meters per second, the second level wind 2-4 meters per second, the third level wind 4-6 meters per second and so on. According to the need, wind power can also be converted into corresponding wind speed, that is, the distance that air flows in unit time, in meters per second. The conversion formula is for reference: two to one is one, and three levels plus one.

Grades four to nine are not difficult to calculate, and the series is reduced by two times three. Ten to twelve are rare, so ten is easy to remember. Ten-level wind speed is twenty-seven, with one more level every four levels. That is, the wind speed of the primary wind is equal to 1 m/s, the wind speed of the secondary wind is equal to 2 m/s, and the wind level of the tertiary wind plus 1 is equal to 4 m/s.

Subtract 2 from the sequence from 4 to 9 and multiply it by 3 to get the corresponding wind speed. The wind speed algorithm from 10 to 12 is the same. The wind speed of 10 is 27m/s, and then the wind speed of 1 1 is 3 1m/s by adding 4, and the wind speed of 12 is 35m/s. ..

Refer to Baidu Encyclopedia-Wind Level