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