What is the wind speed when the small wind flag is fully spread and fluttered?

The wind speed when the small wind flag is fully unfurled and flutters refers to the distance that the air flows in the horizontal direction per unit time, which is classified according to grades. The first-level light smoke is biased, the second-level breeze blows the face, the third-level leaves move the red flag, the fourth-level branches shake the paper, the fifth-level small trees shake with the wind, the sixth-level umbrella is difficult to lift, the seventh-level wind is inconvenient, the eighth-level wind blows the branches off, the ninth-level roof flies, and the tenth-level trees fall down. It's rare to see 112 grades.

The function of small wind flag

A small flag the size of the wind. Different levels of wind flags have different shapes, and the wind vector is composed of wind poles and wind feathers. Wind direction pole refers to the direction of the wind, 8 directions of public media and 16 directions of meteorological observation records. The plume of strong wind is represented by 3 or 4 short strokes and triangles, which are perpendicular to the northern hemisphere at the end of the wind pole.

The wind direction is indicated by eight directions. The short straight line and small triangle above represent the wind speed and are perpendicular to the left side of the wind pole. Relatively long short straight lines are long strokes, and each long stroke represents a wind of 4 meters per second, which is what we call the secondary wind in our forecast. The short stroke is about half of the long stroke, representing a wind of 2 meters per second, which is a first-class wind. Each pennant represents the wind of 20 meters per second, which is equivalent to 8 straight and 9 grades.