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Beaufort Scale of wind speeds

No. Name Speed mph Speed kph Description
0 Calm Less than 1 Less than 1 Calm; smoke rises vertically
1 Light air 1-3 1-5 Direction of wind shown by smoke but not by wind vanes
2 Light breeze 4-7 6-11 Wind felt on face; leaves rustle; wind vane moves
3 Gentle breeze 8-12 12-19 Leaves and small twigs in constant motion; wind extends light flag
4 Moderate breeze 13-18 20-28 Wind raises dust and loose paper; small branches move
5 Fresh breeze 19-24 29-38 Small-leaved trees begin to sway; crested wavelets form on inland waters
6 Strong breeze 25-31 39-49 Large branches move; overhead wires whistle; umbrellas difficult to control
7 Moderate or near gale 32-38 50-61 Whole trees sway; walking against wind is difficult
8 Fresh gale 39-46 62-74 Twigs break off trees; moving cars veer
9 Strong gale 47-54 75-88 Slight structural damage occurs; shingles may blow away
10 Whole gale or storm 55-63 89-102 Trees uprooted; considerable structural damage occurs
11 Storm or violent storm 64-72 103-117 Widespread damage occurs
12 Hurricane Greater than 72 Greater than 117 Widespread damage occurs


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This page (beaufort.html) was last modified on Sunday 27/01/2013