What does it mean that the weather forecast has an F? (Two horizontal lines are curves)

What is the windy Chinese phonetic prefix F? Come on. The bar above represents the size of the wind. The more bars, the stronger the wind. At the same time, the opening direction of f represents the wind direction, that is? Where does the wind come from?

Expand the symbolic meaning of data wind direction and wind power;

Represented by wind vector, it consists of wind stems and wind plumes.

Wind handle: indicates the direction of the wind, with 8 directions.

Wind feather: 3 or 4 short strokes and triangles indicate strong wind, perpendicular to the right side of the wind pole (northern hemisphere).

1- secondary: 1 vertical line 1 horizontal line

Grade 3-4: 1 vertical line and 2 horizontal lines

Layer 5-6: 1 vertical line 3 horizontal line

Grade 7-8: 1 vertical bar 4 horizontal bar.

Above level 8: 1 vertical bar 1 triangle is like a small flag.

References:

Baidu encyclopedia-wind vane