History of Eastern Weather Forecast

East wind refers to the wind blowing from the east.

Meteorology determines the wind direction as the wind direction. The wind blows from the east, and the red flag floats to the west, indicating that the wind blows from the east to the west, so it is easterly weather. 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

One of the instruments for measuring the wind direction is the wind vane, which is generally10-12m above the ground. If there is an obstacle nearby, its height should be at least 6 meters higher than the obstacle, and the short stick pointing north should face north.

In which direction the wind arrow points, it means what direction the wind direction is at that time. There is also a rectangular wind pressure plate (800g in weight and 200g in weight) on the anemometer, and an arc frame with long and short teeth is installed next to the wind pressure plate. The number of long and short teeth that the wind pressure plate passes through indicates the wind force.

Wind vane is one of the most widely used wind direction measuring devices, including single wing type, double wing type and streamlined type. Wind vane is generally an asymmetric balancing device, which consists of four parts: tail wing, pointing rod, balancer and rotating spindle. Its center of gravity is on the axis of the supporting shaft, and the whole wind vane can swing freely around the vertical axis.

China Meteorological Bureau-Wind Vector and Wind Classification

Baidu encyclopedia-wind direction