The Beaufort scale

by Bert Van Kets

Force	MPH	knots	Description	Specification for use on land
0	0-1	0-1	Calm	Calm; Smoke rises verticall
1	1-3	1-3	Light air	Direction of wind shown bysmoke drift, but not by wind vanes
2	4-7	4-6	Light Breeze	Wind felt on face; leaves rustle; ordinary vanes moved by wind
3	8-12	7-10	Gentle Breeze	Leaves and small twigs in constant motion; wind extends light flag
4	13-18	11-16	Modeate Breeze	Raises dust and loose paper;small branches are moved
5	19-24	17-21	Fresh Breeze	Small trees in leaf begin to sway; crested wavelets form on inland waters
6	25-31	22-27	Strong Breeze	Large branches in motion; whistling heard in telegraph wires; umbrellas used
7	32-38	28-33	Near Gale	Whole trees in motion; inconvenience felt when walking against the wind
8	39-46	34-40	Gale	Breaks twigs off trees; generally impedes progress
9	47-54	41-47	Severe Gale	Slight structural damage occurs (chimney-pots and slates removed)
10	55-63	48-55	Storm	Seldom experienced inland; trees uprooted; considerable structural damage oc
11	64-72	56-63	Violent Strom	Very rarely experienced; accompanied by wide-spread damage
12	73-82	64-71	Hurricane	Does this need a description