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The Beaufort Scale SPÉÉP O Knots O mph O km/h Sea like a mirror Smoke rises vertically UANP "Calm'' SPÉÉP 1-3 Knots 1-3 mph 1-6 km/h LANP Ripples with the appearance of scales are formed/ but without foam crests direction of wind shown by smoke but not by wind vanes FORCÉ SPÉÉP 11-16 Knots 13-18 mph 10-29 km/h LANO Small waves/ becoming longer/ fairly frequent white horses Raises dust and loose paper; small branches are moved FORCÉ SPÉÉP 17-21 Knots 19-2H mph 30-39 km/n SBA Moderate waves, taking a more pronounced long form; many white horses are formed. 5 LANP Small trees In leaf begin to sway; wavelets form on inland waters FORCÉ 8 Moderate high waves of greater length; edges of crests begin to break into spindrift. Breaks twigs off trees; generally FORCE SPEEO I cca I high waves. Crests of waves begin to tumble and roll over. Spray may affect visibility Slight structural damage occurs/ chimney pots and slates removed Huge waves; air is filled with foam and spray. Sea white with driving spray; visibility very seriously affected over 63 knots over 72 mph over 117 km/h Countryside is devastated LAN O "Over thousands of years sailors have leamt to estimate the speed of the wind just by looking about. This technique matured into what we now call the Beaufort scale. The universe tells you everything you need to know about it as long as you are prepared to watch/ to listen/ to smell/ in short to observe" Howtoons 2006 FORCE SEA Large wavelets. Crests begin to break. F oam of glassy appearance. LANP Ueaves and small twigs In constant motion; wind extends light flag FORCÉ « SPÉÉP H-€> Knots SEA Small wavelets. Crests have a glassy appearance and do not break z M-7 nph 7-11 km/n LANP Wind felt on face; leaves rustle; ordinary vane moved by wind SPÉÉP 22-27 Knots 25-31 mph M0-50 km/h LANP FORCÉ 6 Large waves begin to form; the white foam crests are more extensive everywhere. Large branches in motion; whistling heard in telegraph wires; umbrellas use difficult. Sea heaps up and white foam from breaking waves starts to blow in streaks with wind. 28-33 Knots Whole trees in motion; umbrellas discarded; inconvenience felt when walking LANP "Near Gaie'' FORCÉ 10 SPÉÉP M8-55 Knots SEA Very high waves. Surface of the sea takes on a white appearance. Visibility affected 55-63 mph 88-102 km/h LANP Seldom experienced inland; trees uprooted; considerable structural damage occurs Sip iJsjllÎ // \/H • A3 Vsvt , y —vi' s'j—'U _ ^ - 7<r. "Storm" Exceptionally high waves. The sea is covered with long white patches of foam. LANP "Violent storm" ''Hurricane"
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