Beaufort Scale

Beaufort Number	M.P.H	Term	Effects on Sea	Effects on Land	Wave Height
0	< 1	Calm	Sea like a mirror	Calm, smoke goes up	0
1	1 - 3	Light air	Slight ripples	Smoke shows direction	.3
2	4 - 7	Light Breeze	Small wavelets	Leaves Rustle	.6
3	8 - 12	Gentle Breeze	Large wavelets	Leaves, twigs in motion	1-3
4	13-18	Moderate Breeze	Waves with some whitecaps	Dust, leaves, paper easily flutter	3-4
5	19-24	Fresh Breeze	Moderate waves	Small trees sway	4-8
6	25-31	Strong Breeze	Larger waves, spray, many whitecaps	Larger branches moving, wires whistling	8-12
7	32-38	Near Gale	White foam from whitecaps	Whole trees move, hard to walk	12-17
8	39-46	Gale	Higher waves of more length, foam streaks	Small branches of trees broken, more resistance	17-21
9	47-54	Strong Gale	High waves, sea rolls	Small building damage	21-30
10	55-63	Storm	Very high waves with crests, sea looks mostly white	Trees break or uproot, Large building damage	30-38
11	64-72	Violent Storm	Air has much foam,sea mostly white, poor visibility.	Seldom on land, much damage	38-45
12-17	73-136	Hurricane	Air filled with foam, sea completely white, very little visibility	Very rare on land, extremely widespread damage	> 45