Beaufort Wind Scala
Bft	m/sec			km/h			Knots Wind			Wave  Height in m			W M O Description	Effects observed on sea
0	0,0	-	0,2	0	-	1	0	-	1				Calm	Sea like mirror.
1	0,3	-	1,5	1	-	5	1	-	3	0,1			Light air	Ripples with appearance of scales; no foam crests.
2	1,6	-	3,3	6	-	11	4	-	6	0,2	-	0,5	Light breeze	Small wavelets; crests of glassy appearance, not  breaking.
3	3,4	-	5,4	12	-	19	7	-	10	0,5	-	1,0	Gentle breeze	Large wavelets; crests begin to break; scattered  whitecaps.
4	5,5	-	7,9	20	-	28	11	-	16	1,0	-	2,0	Moderate breeze	Small waves, becoming longer; numerous whitecaps.
5	8,0	-	10,7	29	-	38	17	-	21	2,0	-	3,0	Fresh breeze	Moderate waves, taking longer form; many white  caps; some spray.
6	10,8	-	13,8	39	-	49	22	-	27	3,0	-	4,0	Strong breeze	Larger waves forming whitecaps everywhere;  more spray.
7	13,9	-	17,1	50	-	61	28	-	33	4,0	-	5,5	Near Gale	Sea heaps up; white foam from breaking waves  begin to be blown in streaks.
8	17,2	-	20,7	62	-	74	34	-	40	5,5	-	7,5	Gale	Moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks.
9	20,8	-	24,4	75	-	88	41	-	47	7,0	-	10,0	Strong gale	High waves; sea begins to roll; dense streaks of  foam; spray may reduce visibility.
10	24,5	-	28,4	89	-	102	48	-	55	9,0	-	12,5	Storm	Very high waves with overhanging crests; sea takes white appearance as foam is blown in very dense streaks; rolling is heavy and visibility reduced.
11	28,4	-	32,6	103	-	117	56	-	63	11,5	-	16,0	Violent storm	Exceptionally high waves; sea covered with foam  patches; visibility still more reduced.
12	32,7	-		118	-	133	64	-	71	14,0	+		Hurricane	Air filled with foam; sea completely white with driving  spray; visibility greatly reduced.

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