Level 0, calm, wind speed: 0~0.2 m/s, land conditions: calm, smoke rising upwards. All the fools know that.
Level 1, gentle wind, wind speed: 0.3 ~ 1.5 m/s, land conditions: smoke can indicate the wind direction, but the weather vane cannot rotate.
Level 2, light wind, wind speed: 1.6 ~ 3.3 m/s, land conditions: people feel windy, leaves emit a slight noise and the weather vane can turn.
Level 3, breeze, wind speed: 3.4~5.4 m/s, terrain conditions: leaves and branches swaying, flags are displayed.
Level 4, gentle wind, wind speed: 5.5 ~ 7.9 m/s, terrain conditions: can blow dust and paper onto the ground, and tree twigs move slightly.
Level 5, cool wind, wind speed: 8.0~10.7 m/s, land conditions: small branches with swaying leaves and small waves atthe surface of inland waters.
Level 6, strong wind, wind speed: 10.8~13.8 m/s, terrain conditions: large swaying branches, whirring power lines, and it is difficult to lift an umbrella.
Level 7, strong wind, wind speed: 13.9~17.1 m/s, terrain conditions: the whole tree shakes and it is inconvenient to walk in the wind.
Level 8, strong wind, wind speed: 17.2~20.7 m/s, terrain conditions: small branches were broken and people felt great resistance when moving forward.
Level 9, strong wind, wind speed: 20.8~24.4 m/s, terrain conditions: buildings are damaged (top of chimney and tiles move).
Level 10, strong wind, wind speed: 24.5~28.4 m/s, land conditions: rare on land, when seen, trees may be uprooted and buildings may be seriously damaged.
Level 11, storm, wind speed: 28.5~32.6m/s, land conditions: little on land, if any, there will be major damage.
Category 12, hurricane, wind speed: 32.7~36.9 m/s, land conditions: rare on land, and its destructive power is extremely high.
Indeed, in nature, the wind force sometimes exceeds level 12. For example, the wind force in the center of a strong typhoon or the wind force of a tornado can be much stronger than level 12. However, strong winds above level 12 are relatively rare and usually the level is not specified.
Level 0 means no wind, silent smoke rises upwards.
Level 1, gentle wind, leaves moving slightly, smoke can indicate direction.
Level 2, light wind, the leaves rustle slightly and people have the wind in their faces.
Level 3: breeze, swaying leaves and twigs, and flags that can be displayed.
Level 4, gentle wind, can blow fromdust, pieces of paper and swinging small branches.
Level 5, light wind, sometimes small swaying trees and small waves on the surface of inland waters.
Level 6, strong wind, large branches shaking, wires whirring, making it difficult to lift an umbrella.
Level 7, strong wind, the whole tree shakes, large branches bend, making it difficult to walk in the wind.
Level 8, strong wind, broken branches, great resistance to walking in the wind.
Level 9, strong wind, the roof of the bungalow was damaged and the cabin was damaged.
Level 10, strong wind, can uproot trees and bring down buildings .
Level 11, storm, rarely seen on land, very destructive, causing heavy losses.
Category 12, a hurricane, is rare on earth and its destructive power is extremely high.