Wind is the horizontal movement of air, and it is a vector (or vector) expressed by direction (wind direction) and speed (wind speed).
Wind data is one of the important meteorological data, which is indispensable in both theoretical research and various departments of national economic construction, such as agriculture, transportation, construction, water conservancy projects, recuperation and other departments. Wind is the horizontal movement of air, and it is a vector (or vector) expressed by direction (wind direction) and speed (wind speed). Wind direction refers to the direction in which the wind comes. Except for the still wind, it is indicated by bearing 16. Wind speed refers to the ratio of the distance traveled by air to the time required for the distance traveled, and the unit is meters per second. Regular observation (4 times a day at the basic station and 24 times a day at the reference station), take an integer, record it by yourself, and take one decimal place.
Relative to the air movement on the ground, wind usually refers to its horizontal component, which is manifested as wind direction, wind speed or wind force. Wind direction refers to the direction of airflow, which is often recorded in the direction of 16. Wind speed is the horizontal distance that air moves in unit time, in meters per second. The horizontal wind speed in the atmosphere is generally 1.0 ~ 10 m/s, typhoons and tornadoes can sometimes reach 102 m/s, and the wind speed in farmland can be less than 0. 1 m/s. There are two kinds of observation data of wind speed: instantaneous value and average value, and the average value is generally adopted. Wind is measured by electric anemometer, portable anemometer, Dyne anemometer and hot ball anemometer, which is used to measure the breeze in farmland. It can also be estimated according to the wind level and the signs of ground objects.
Wind songs
The 0-level smoke column goes straight into the sky, and the 1 level blue smoke is zero-level wind, and the smoke goes straight up; The first grade wind, the smoke is slightly biased;
The second level wind blows the face, the third level leaves move the red flag to show the second level wind, and the leaves ring; The third wind, the flag fluttering;
Level 4 wind blows paper, level 5 small trees with leaves shake level 4 wind, and the dust is flying; Five winds and waves;
It is difficult to walk with an umbrella at level 6, inconvenient to walk in the wind at level 7, and the trees are shaking; Seven winds, difficult to go;
Grade 8 wind breaks branches, grade 9 roof tiles fly, and grade 8 wind breaks branches; Nine winds, the chimney collapsed;
10 level uprooting trees and toppling houses, 10 level wind, uprooting; Xi. Scarcity of land;
1 1, 12 is rare on land, and 12 is even less, with strong winds howling and huge waves.
13, 14 is terrible.