WIND SPEED TABLE Height of M.P.H Term Effects at Sea Effects on Land Waves, FT. ----- ---- -------------- --------------- --------- < 1 Calm Sea like a mirror Calm, smoke goes up 0 1-3 Light air Slight ripples Smoke shows direction 0 4-7 Light Breeze Small wavelets Leaves Rustle .33 8-12 Gentle Breeze Large wavelets Leaves, twigs in motion 1-2 13-18 Moderate Waves w/whitecaps Dust, leaves, paper, 2-4 Breeze easily flutter 19-24 Fresh Breeze Moderate waves Small trees sway 4-8 25-31 Strong Breeze Larger waves, spray Larger branches moving 8-13 many whitecaps wires whistling. 32-38 Near Gale White foam from Whole trees move, 13-17 whitecaps hard to walk. M.P.H Term Effects at Sea Effects on Land Waves, FT. ----- ---- -------------- --------------- --------- 39-46 Gale Higher waves of more Small branches of trees 18-20 length, foam streaks broken, more resistance 47-54 Strong Gale High waves, sea rolls Small building damage 55-63 Storm Very high waves with Trees break, uproot, 20-30 crests, sea looks Large building damage mostly white. 64-72 Violent Air has much foam, Seldom on land, much 30-45 Storm sea mostly white, damage. poor visibility. 73-136 Hurricane Air filled w/foam, Very rare on land, > 45 sea completely extremely widespread white, very little damage. visibility.