The red flag floating to the north indicates what wind is blowing.

The red flag floating to the north means that there is wind in the south.

Meteorology determines the wind direction as the wind direction. The red flag floating to the north means that the wind blows from the south to the north, so it is southerly. When the meteorological station forecasts the wind, the wind direction swings from side to side in a certain direction. When it is uncertain, the word "bias" is used, such as northerly wind. When the wind is very small, it is explained by "uncertain wind direction"

China's meteorological department uses wind vector to represent wind, which consists of wind pole and wind plume. The wind column points out the direction of the wind, which has eight directions, namely, north, northeast, east, southeast, south, southwest, west and northwest. Wind feather refers to the short dash and small triangle at the end of the wind pole perpendicular to the right side (northern hemisphere), which is used to express the wind speed. The long dash represents 4m/s, the short dash represents 2m/s and the triangle represents 20m/s. ..

Extended data

A phenomenon corresponding to the magnitude of wind power

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. Meteorologically, at present, it is generally divided into thirteen grades according to the magnitude of wind (for some typhoons, it is divided into 17 grade):

I, 0 smoke column into the sky.

Second, 1 light smoke is downwind.

Level 3 or 2 breeze blows your face.

Level 4 and Level 3 Moving Leaf Red Flag Exhibition

Five or four pieces of flying paper.

Small trees of grade six or five with leaves.

It is difficult to walk with an umbrella in grades 7 and 6.

Grade 8 and 7 are not convenient to walk in the wind.

The wind of 1998 blew off branches.

10 and 9 roof flying tiles

1 1, 10 uproot trees and tear down houses.

12. Grade 1 1 is rare on land.

XIII. 12 Typhoon at Sea

China Meteorological Bureau-Wind Vector and Wind Classification

Baidu Encyclopedia-Wind Direction (Chinese Vocabulary)