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Beaufort Windspeed Scale

BEAUFORT SCALE: Measured 10m above ground

Beaufort # Equivalent
Speed (mph)		  Description SPECIFICATIONS FOR USE ON LAND
0 0-1 Calm Calm; smoke rises vertically.
1 1-3 Light air Direction of wind shown by smoke drift, but not by wind vanes.
2 4-7 Light Breeze Wind felt on face; leaves rustle; ordinary vanes moved by wind.
3  8-12  Gentle Breeze Leaves and small twigs in constant motion; wind extends light flag.
4 13-18  Moderate Breeze Raises dust and loose paper; small branches are moved.
5 19-24 Fresh Breeze Small trees in leaf begin to sway; crested wavelets form on inland waters.
6 25-31 Strong Breeze Large branches in motion; whistling heard in telephone  wires; umbrellas used with difficulty.
7 32-38  Near Gale Whole trees in motion; inconvenience felt when walking against the wind.