Força do vento 0 - Calm

Impacto sobre a terra

Calm, smoke rises vertically

Estado do mar

Sea surface smooth and mirror-like

Velocidade
  • 0-1 km/h
  • 0-0,54 noeuds (knot)
  • 0 - 0,621 mph
hauteur
  • 0 m
  • 0 ft
 Signe

Força do vento 1 - Light Air

Impacto sobre a terra

Smoke drift indicates wind direction, still wind vanes

Estado do mar

Scaly ripples, no foam crests

Velocidade
  • 1-5 km/h
  • 0,54-2,7 noeuds (knot)
  • 0,621 - 3,11 mph
hauteur
  • 0 - 0,1 m
  • 0-1 ft
 Signe

Força do vento 2 - Light Breeze

Impacto sobre a terra

Wind felt on face, leaves rustle, vanes begin to move

Estado do mar

Small wavelets, crests glassy, no breaking

Velocidade
  • 5-11 km/h
  • 2,7-5,9 noeuds (knot)
  • 3,11-6,84 mph
hauteur
  • 0,1 - 0,5 m
  • 1-2 ft
 Signe

Força do vento 3 - Gentle Breeze

Impacto sobre a terra

Leaves and small twigs constantly moving, light flags extended

Estado do mar

Large wavelets, crests begin to break, scattered whitecaps

Velocidade
  • 11-19 km/h
  • 5.9-10,2 noeuds (knot)
  • 6,84-11,81 mph
hauteur
  • 0,5 - 1,25 m
  • 2-3,5 ft
 Signe

Força do vento 4 - Moderate Breeze

Impacto sobre a terra

Dust, leaves, and loose paper lifted, small tree branches move

Estado do mar

Small waves. becoming longer, numerous whitecaps

Velocidade
  • 19-28 km/h
  • 10,2-15 noeuds (knot)
  • 11,81-17,4 mph
hauteur
  • 1-2 m
  • 3,5-6 ft
 Signe

Força do vento 5 - Fresh Breeze

Impacto sobre a terra

Small trees in leaf begin to sway

Estado do mar

Moderate waves taking longer form, many whitecaps, some spray

Velocidade
  • 28-38 km/h
  • 15-20,5 noeuds (knot)
  • 17,4-23,61 mph
hauteur
  • 2-3 m
  • 6-9 ft
 Signe

Força do vento 6 - Strong Breeze

Impacto sobre a terra

Larger tree branches moving, whistling in wires

Estado do mar

Larger waves , whitecaps common, more spray

Velocidade
  • 38-50 km/h
  • 20,5-27 noeuds (knot)
  • 23,61-31,07 mph
hauteur
  • 3-4 m
  • 9-13 ft
 Signe

Força do vento 7 - Near Gale

Impacto sobre a terra

Whole trees moving, resistance felt walking against wind

Estado do mar

Sea heaps up, waves , white foam streaks off breakers

Velocidade
  • 50-61 km/h
  • 27-33 noeuds (knot)
  • 31,07-37,9 mph
hauteur
  • 4-5,5 m
  • 13-19 ft
 Signe

Força do vento 8 - Gale

Impacto sobre a terra

Whole trees in motion, resistance felt walking against wind

Estado do mar

Moderately high waves of greater length, edges of crests begin to break into spindrift, foam blown in streaks

Velocidade
  • 62-74 km/h
  • 33-40 noeuds (knot)
  • 37,9-45,98 mph
hauteur
  • 5,5-7,5 m
  • 18-25 ft
 Signe

Força do vento 9 - Strong Gale

Impacto sobre a terra

Slight structural damage occurs, slate blows off roofs

Estado do mar

High waves, sea begins to roll, dense streaks of foam, spray may reduce visibility

Velocidade
  • 75-88 km/h
  • 40-47,5 noeuds (knot)
  • 45,98-54,68 mph
hauteur
  • 7-10 m
  • 23-32 ft
 Signe

Força do vento 10 - Storm

Impacto sobre a terra

Seldom experienced on land, trees broken or uprooted,considerable structural damage

Estado do mar

Very high waves with overhanging crests, sea white with densely blown foam, heavy rolling, lowered visibility

Velocidade
  • 89-102 km/h
  • 47,5-55 noeuds (knot)
  • 54,68-63,38 mph
hauteur
  • 9-12,5 m
  • 29-41 ft
 Signe

Força do vento 11 - Violent Storm

Impacto sobre a terra

Widespread devastation

Estado do mar

Exceptionally high waves, foam patches cover sea, visibility more reduced

Velocidade
  • 103-117 km/h
  • 55-63 noeuds (knot)
  • 63,38-72,2 mph
hauteur
  • 11,5-16 m
  • 37-52 ft
 Signe

Força do vento 12 - Hurricane

Impacto sobre a terra

Considerable destruction

Estado do mar

Air filled with foam, sea completely white with driving spray, visibility greatly reduced

Velocidade
  • >118 km/h
  • >63 noeuds (knot)
  • >72,2 mph
hauteur
  • >14 m
  • >46 ft
 Signe