What is wind direction and wind force?

So, how do people distinguish the size and direction of the wind? The wind direction in the weather forecast refers to the direction in which the wind blows. For example, the north wind, that is, the wind blows from the north, and it is easier to go south with the wind than to go north with the wind. The wind direction in the weather forecast is divided into eight directions, namely, north wind, northeast wind, east wind, southeast wind, south wind, southwest wind, west wind and northwest wind. Observing the size of the wind in meteorology is to measure how many meters the air moves in the direction parallel to the ground in 1 s, which is called wind speed. More rice means more wind, less rice means less wind. Wind speed is related to the wind force in the weather forecast. For example, level 0 means that there is no wind, and the smoke from the chimney is rising, and the wind speed is 0 ~ 0.2 m/s; 1, called soft wind, smoke can float with the wind, the wind direction can be measured, and the wind speed is 0.3 ~1.5m/s; Level 8, called gale, wind speed 17.2 ~ 20.7 m/s, can break branches. If you walk against the wind, people will feel great resistance.