DeltaWeatherCam Beaufort Scale of Wind Speed

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Beaufort Scale of Wind Speeds - - Temp 43.5° F

Beaufort Wind Scale

Developed in 1805 by Sir Francis Beaufort of England

Force	Wind (mph)	WMO* Classification	Appearance of Wind Effects
Force	Wind (mph)	WMO* Classification	On Land	On the Water
0	Less than 1	Calm	Calm, smoke rises vertically	Sea surface smooth and mirror-like
1	1-3	Light Air	Smoke drift indicates wind direction, still wind vanes	Scaly ripples, no foam crests
2	4-7	Light Breeze	Wind felt on face, leaves rustle, vanes begin to move	Small wavelets, crests glassy, no breaking
3	8-12	Gentle Breeze	Leaves and small twigs constantly moving, light flags extended	Large wavelets, crests begin to break, scattered whitecaps
4	13-18	Moderate Breeze	Dust, leaves, and loose paper lifted, small tree branches move	Small waves 1-4 ft. becoming longer, numerous whitecaps
5	19-24	Fresh Breeze	Small trees in leaf begin to sway	Moderate waves 4-8 ft taking longer form, many whitecaps, some spray
6	25-31	Strong Breeze	Larger tree branches moving, whistling in wires	Larger waves 8-13 ft, whitecaps common, more spray
7	32-38	Near Gale or Moderate Gale	Whole trees moving, resistance felt walking against wind	Sea heaps up, waves 13-20 ft, white foam streaks off breakers
8	39-46	Fresh Gale or Gale	Whole trees in motion, resistance felt walking against wind	Moderately high (13-20 ft) waves of greater length, edges of crests begin to break into spindrift, foam blown in streaks
9	47-54	Strong Gale	Slight structural damage occurs, slate blows off roofs	High waves (20 ft), sea begins to roll, dense streaks of foam, spray may reduce visibility
10	55-63	Whole Gale or Storm	Seldom experienced on land, trees broken or uprooted, "considerable structural damage"	Very high waves (20-30 ft) with overhanging crests, sea white with densely blown foam, heavy rolling, lowered visibility
11	64-74	Violent Storm	Very rarely experienced, accompanied by widespread damage	Exceptionally high (30-45 ft) waves, foam patches cover sea, visibility more reduced
12	75+	Hurricane	Devastation occurs	Air filled with foam, waves over 45 ft, sea completely white with driving spray, visibility greatly reduced

*WMO - World Meteorological Organization

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