Forza del vento 0 - Calm

Impatto sulla terra

Calm, smoke rises vertically

Stato del mare

Sea surface smooth and mirror-like

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

Forza del vento 1 - Light Air

Impatto sulla terra

Smoke drift indicates wind direction, still wind vanes

Stato del mare

Scaly ripples, no foam crests

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

Forza del vento 2 - Light Breeze

Impatto sulla terra

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

Stato del mare

Small wavelets, crests glassy, no breaking

Velocità
  • 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

Forza del vento 3 - Gentle Breeze

Impatto sulla terra

Leaves and small twigs constantly moving, light flags extended

Stato del mare

Large wavelets, crests begin to break, scattered whitecaps

Velocità
  • 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

Forza del vento 4 - Moderate Breeze

Impatto sulla terra

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

Stato del mare

Small waves. becoming longer, numerous whitecaps

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

Forza del vento 5 - Fresh Breeze

Impatto sulla terra

Small trees in leaf begin to sway

Stato del mare

Moderate waves taking longer form, many whitecaps, some spray

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

Forza del vento 6 - Strong Breeze

Impatto sulla terra

Larger tree branches moving, whistling in wires

Stato del mare

Larger waves , whitecaps common, more spray

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

Forza del vento 7 - Near Gale

Impatto sulla terra

Whole trees moving, resistance felt walking against wind

Stato del mare

Sea heaps up, waves , white foam streaks off breakers

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

Forza del vento 8 - Gale

Impatto sulla terra

Whole trees in motion, resistance felt walking against wind

Stato del mare

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

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

Forza del vento 9 - Strong Gale

Impatto sulla terra

Slight structural damage occurs, slate blows off roofs

Stato del mare

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

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

Forza del vento 10 - Storm

Impatto sulla terra

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

Stato del mare

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

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

Forza del vento 11 - Violent Storm

Impatto sulla terra

Widespread devastation

Stato del mare

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

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

Forza del vento 12 - Hurricane

Impatto sulla terra

Considerable destruction

Stato del mare

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

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