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 with leaves shake;
Level 6 is difficult to walk with 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 levels are rare on land.
Extended data:
Wind speed can only be graded if there is no grade, and wind speed is the basis for wind grading. Generally speaking, the greater the wind speed, the higher the wind level and the more destructive the wind is. Wind speed is one of the main parameters in climatology research.
When the wind force is below level 5, the wind speed is equivalent to 1-25 kilometers per hour, which is equivalent to riding a bike to work or having an outing. When there are 5~7 winds, the converted speed is roughly equivalent to the speed of 30-60 kilometers per hour in the general urban road network.
When the wind force is 8~ 1 1, it can be understood as driving on an expressway or expressway at a speed of 60~ 1 17 km/h. The wind of 12- 17, with the speed of120-220km per hour, is rarely seen on land except near the typhoon center at sea, and when a strong typhoon lands and some mountain passes.