![]() ![]() Slight structural damage occurs, slate blows off roofs.īeaufort Force 10 - Winds 48-55 kt, Storm, Very high waves (20 -30 ft) with overhanging crests, sea white densely blown foam, heavy rolling, lowered visibility. Whole trees in motion, resistance felt walking against wind.īeaufort Force 9 - Winds 41-47 kt, Strong Gale, High waves (20 ft), sea begins to roll, dense streaks of foam, spray may reduce visibility. Whole trees moving, resistance felt walking against wind.īeaufort Force 8 - Winds 34-40 kt Gale, Moderately high (13 -20 ft) waves of greater length, edges of crests begin to break into spindrift, foam blown in streaks. Larger tree branches moving, whistling in wires.īeaufort Force 7 - Winds 28-33 kt, Near Gale, Sea heaps up, waves 13 -20 ft, white foam streaks off breakers. ![]() Small trees in leaf begin to sway.īeaufort Force 6 - Winds 22-27 kt, Strong Breeze, Larger waves 8 -13 ft, whitecaps common, more spray. Dust, leaves, and loose paper lifted, small tree branches move.īeaufort Force 5 - Winds 17-21 kt, Fresh Breeze, Moderate waves 4 -8 ft taking longer form, many whitecaps, some spray. Leaves and small twigs constantly moving, light flags extended.īeaufort Force 4 - Winds 11-16 kt, Moderate Breeze, Small waves 1 -4 ft. Wind felt on face, leaves rustle, vanes begin to move.īeaufort Force 3 - Wind 7-10 kt, Gentle Breeze, Large wavelets, crests begin to break, scattered whitecaps. Smoke drift indicates wind direction, still wind vanes.īeaufort Force 2 - Wind 4-6 kt, Light Breeze, Small wavelets, crests glassy, no breaking waves. Smoke rises vertically.īeaufort Force 1 - Wind 1-3 kt, Light Air, Scaly ripples, no foam crests. Since that time, the scale has been modernized for effects on land.īeaufort Force 0 - Wind less than 1 kt, Calm, Sea surface smooth and mirror-like. It was invented in the early 19th Century by Admiral Sir Francis Beaufort of the British Navy as a way to interpret winds from conditions at sea. Beaufort Scale The Beaufort wind scale is a system used to estimate and report wind speeds when no measuring apparatus is available. ![]() NOAA's National Weather Service - Glossary Backscatter The portion of power scattered back in the incident direction. ![]()
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