Beaufort number	Description term		Wind speeds		Wave height (m)
	Wind	Wave	knots	m/s	probable	maximum
0	Calm	-	< 1	0 - 0.2	-	-
1	Light air	Ripples	1 - 3	0.3 - 1.5	0.1	0.1
2	Light breeze	Small wavelets	4 - 6	1.6 - 3.3	0.2	0.3
3	Gentle breeze	Large wavelets	7 - 10	3.4 - 5.4	0.6	1.0
4	Moderate breeze	Small waves	11 - 16	5.5 - 7.9	1.0	1.5
5	Fresh breeze	Moderate waves	17 - 21	8.0 - 10.7	2.0	2.5
6	Strong breeze	Large waves	22 - 27	10.8 - 13.8	3.0	4.0
7	Near gale	Large waves	28 - 33	13.9 - 17.1	4.0	5.5
8	Gale	Moderately high waves	34 - 40	17.2 - 20.7	6.0	7.5
9	Strong gale	High waves	41 - 47	20.8 - 24.4	7.0	10.0
10	Storm	Very high waves	48 - 55	24.5 - 28.4	9.0	12.5
11	Violent storm	Exceptionally high waves	56 - 63	28.5 - 32.6	11.5	16.0
12	Hurricane	Exceptionally high waves	64 - 71	32.7 - 36.9	14.0	> 16
13	Hurricane	Exceptionally high waves	72 - 80	37.0 - 41.4	> 14	> 16
14	Hurricane	Exceptionally high waves	81 - 89	41.5 - 46.1	> 14	> 16
15	Hurricane	Exceptionally high waves	90 - 99	46.2 - 50.9	> 14	> 16
16	Hurricane	Exceptionally high waves	100 - 109	51.0 - 56.0	> 14	> 16
17	Hurricane	Exceptionally high waves	109 - 118	56.1 - 61.2	> 14	> 16

Wave Height Estimates