Beaufort Scale

Beaufort Scale Beaufort Scale

Beau-
fort
number knots mi h^-1 m s^-1 km h^-1 Seaman's term World Meteoro-
logical Organi-
zation
(1964) Effects observed
at sea Effects observed on land

0 <<1 <<1 0,0-0,2 <<1 Calm Calm Sea like mirror. Calm; smoke rises vertically.

1 1-3 1-3 0,3-1,5 1-5 Light air Light air Ripples with appearance of scales; no foam crests. Smoke drift indicates wind direction; vanes do not move.

2 4-7 4-7 1,6-3,3 6-11 Light breeze Light breeze Small wavelets; crests of glassy appearance, not braking. Wind felt on face; leaves rustle; vanes begin to move.

3 7-10 8-12 3,4-5,4 12-19 Gentle breeze Gentle breeze Large wavelets; crests begin to brake; scattered whitecaps. Leaves, small twigs in constant motion; light flags extended.

4 11-16 13-18 5,5-7,9 20-28 Moderate breeze Moderate breeze Small waves, becoming longer; numerous whitecaps. Dust, leaves, and loose paper raised up; small branches move.

5 17-21 19-24 8,0-10,7 29-38 Fresh breeze Fresh breeze Moderate waves, taking longer form; many whitecaps; some spray. Small trees in leaf begin to sway.

6 22-27 25-31 10,8-13,8 39-49 Strong breeze Strong breeze Larger waves forming; whitecaps everywhere; more spray. Larger branches of trees in motion; whistling heard in wires.

7 28-33 32-38 13,9-17,1 50-61 Moderate gale Near gale Sea heaps up; white foam from breaking waves begins to be blown in streaks. Whole trees in motion; resistance felt in walking against wind.

8 34-40 39-46 17,2-20,7 62-74 Fresh gale Gale Moderately high waves of greater length;edges of crests begin to break into spindrift; foam is blown in well marked streaks. Twigs and small branches broken off trees; progress generally impeded.

Source: AMERICAN PRACTICAL NAVIGATOR by Bowditch.

Beau- fort number	knots	mi h^-1	m s^-1	km h^-1	Seaman's term	World Meteoro- logical Organi- zation (1964)	Effects observed at sea	Effects observed on land
0	<<1	<<1	0,0-0,2	<<1	Calm	Calm	Sea like mirror.	Calm; smoke rises vertically.
1	1-3	1-3	0,3-1,5	1-5	Light air	Light air	Ripples with appearance of scales; no foam crests.	Smoke drift indicates wind direction; vanes do not move.
2	4-7	4-7	1,6-3,3	6-11	Light breeze	Light breeze	Small wavelets; crests of glassy appearance, not braking.	Wind felt on face; leaves rustle; vanes begin to move.
3	7-10	8-12	3,4-5,4	12-19	Gentle breeze	Gentle breeze	Large wavelets; crests begin to brake; scattered whitecaps.	Leaves, small twigs in constant motion; light flags extended.
4	11-16	13-18	5,5-7,9	20-28	Moderate breeze	Moderate breeze	Small waves, becoming longer; numerous whitecaps.	Dust, leaves, and loose paper raised up; small branches move.
5	17-21	19-24	8,0-10,7	29-38	Fresh breeze	Fresh breeze	Moderate waves, taking longer form; many whitecaps; some spray.	Small trees in leaf begin to sway.
6	22-27	25-31	10,8-13,8	39-49	Strong breeze	Strong breeze	Larger waves forming; whitecaps everywhere; more spray.	Larger branches of trees in motion; whistling heard in wires.
7	28-33	32-38	13,9-17,1	50-61	Moderate gale	Near gale	Sea heaps up; white foam from breaking waves begins to be blown in streaks.	Whole trees in motion; resistance felt in walking against wind.
8	34-40	39-46	17,2-20,7	62-74	Fresh gale	Gale	Moderately high waves of greater length;edges of crests begin to break into spindrift; foam is blown in well marked streaks.	Twigs and small branches broken off trees; progress generally impeded.

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