First-class light smoke deviates with the wind; The second breeze blows the face; Three-level moving leaf red flag exhibition; Four-stage branch flying paper; Five-level small trees sway in the wind. Level 6 is difficult to carry an umbrella; It is inconvenient to walk in the wind in the seventh grade; Eight winds blow off branches; Nine-level roof flying tiles; Ten-level uprooting trees and toppling houses; Eleven or two grades are rare.

Beaufort scale is an international wind scale, which was drawn up by Francis Beaufort, an Englishman, in 1805, to indicate the intensity grade of wind. Wind scale, referred to as wind scale, is a kind of expression of wind strength (wind power), so it is also called "Beaufort Wind Scale".

Initially, according to the influence of wind on ground objects or sea surface, it is divided into 0- 12 grade and *** 13 grade. Starting from 1946, the wind level was expanded to 18 (0- 17). Beaufort watches were originally used only at sea, but they can also be used on land after improvement.

12 wind refers to the wind with a wind speed of 32.7 ~ 36.9 m/s, and according to Beaufort's wind scale, the wind can be divided into 0 ~12 * *13. 12 wind, also known as hurricane, is rare on land and has great destructive power.

12 hurricane can increase water in coastal waters, and the maximum water increase in Jiangsu Province can reach 3 meters. When crossing the border, it often brings stormy weather and sets off huge waves on the sea, which seriously threatens navigation safety; The storm after landing may destroy crops and various building facilities, causing great losses to people's lives and property; Cause house collapse, glass fragments, floating objects collision, falling from high altitude, etc. Can cause all kinds of injuries.