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Beaufort Scale of Wind Speeds - - Temp 26.5° F

Beaufort Wind Scale

Developed in 1805 by Sir Francis Beaufort of England


Force Wind
(mph)
WMO*
Classification
Appearance of Wind Effects
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