Beaufort Wind Chart Estimating Winds Speeds - （蒲福风力图估计风速度,）.pdf

Beaufort Wind Chart – Estimating Winds Speeds Beaufort MPH Number Range Average Terminology Description 0 0 0 Calm Calm. Smoke rises vertically. 1 1-3 2 Light air Wind motion visible in smoke. 2 4-7 6 Light breeze Wind felt on exposed skin. Leaves rustle. Gentle 3 8-12 11 Leaves and smaller twigs in constant motion. breeze Moderate Dust and loose paper is raised. Small branches 4 13-18 15 breeze begin to move. 5 19-24 22 Fresh breeze Smaller trees sway. Strong Large branches in motion. Whistling heard in 6 25-31 27 breeze overhead wires. Umbrella use becomes difficult. Whole trees in motion. Some difficulty when 7 32-38 35 Near gale walking into the wind. 8 39-46 42 Gale Twigs broken from trees. Cars veer on road. Severe 9 47-54 50 Light structure damage. gale Trees uprooted. Considerable structural 10 55-63 60 Storm damage. Violent 11 64-73