Beaufort Scale

No. Description Features Speed (mph)
0 Calm Smoke rises vertically; water smooth 01
1 Light Air Smoke shows wind direction; water ruffled 13
2 Light Breeze Leaves rustle; wind felt on face 47
3 Gentle Breeze Loose paper blows around 812
4 Moderate Breeze Branches sway 1318
5 Fresh Breeze Small trees sway, leaves blown off 1924
6 Strong Breeze Whistling in telephone wires; sea spray from waves 25-31
7 Near Gale Large trees sway 3238
8 Gale Twigs break from trees 3946
9 Strong Gale Branches break from trees 4754
10 Storm Trees uprooted; weak buildings collapse 5563
11 Violent Storm Widespread damage 6473
12 Hurricane Widespread structural damage above 74