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Force	Wind (Knots)	Classification	Wind Effect
0	less than 1	Calm	Sea surface smooth and mirror-like
1	1 to 3	Light Air	Scaly ripples, no foam crests
2	4 to 6	Light Breeze	Small wavelets, crests glassy, no breaking
3	7 to 10	Gentle Breeze	Large wavelets, crests begin to break, scattered whitecaps
4	11 to 16	Moderate Breeze	Small waves 1-4 ft. becoming longer, numerous whitecaps
5	17 to 21	Fresh Breeze	Moderate waves 4-8 ft taking longer form, many whitecaps, some spray
6	22 to 27	Strong Breeze	Larger waves 8-13 ft, whitecaps common, more spray
7	28 to 33	Near Gale	Sea heaps up, waves 13-20 ft, white foam streaks off breakers
8	34 to 40	Gale	Moderately high (13-20 ft) waves of greater length, edges of crests begin to break into spindrift, foam blown in streaks
9	41 to 47	Strong Gale	High waves (20 ft), sea begins to roll, dense streaks of foam, spray may reduce visibility
10	48 to 55	Storm	Very high waves (20-30 ft) with overhanging crests, sea white with densely blown foam, heavy rolling, lowered visibility
11	56 to 63	Violent Storm	Exceptionally high (30-45 ft) waves, foam patches cover sea, visibility more reduced
12	64+	Hurricane	Air filled with foam, waves over 45 ft, sea completely white with driving spray, visibility greatly reduced