Upepo wa nguvu 0 - Calm

Athari kwa nchi

Calm, smoke rises vertically

Bahari hali

Sea surface smooth and mirror-like

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

Upepo wa nguvu 1 - Light Air

Athari kwa nchi

Smoke drift indicates wind direction, still wind vanes

Bahari hali

Scaly ripples, no foam crests

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

Upepo wa nguvu 2 - Light Breeze

Athari kwa nchi

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

Bahari hali

Small wavelets, crests glassy, no breaking

Kasi
  • 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

Upepo wa nguvu 3 - Gentle Breeze

Athari kwa nchi

Leaves and small twigs constantly moving, light flags extended

Bahari hali

Large wavelets, crests begin to break, scattered whitecaps

Kasi
  • 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

Upepo wa nguvu 4 - Moderate Breeze

Athari kwa nchi

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

Bahari hali

Small waves. becoming longer, numerous whitecaps

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

Upepo wa nguvu 5 - Fresh Breeze

Athari kwa nchi

Small trees in leaf begin to sway

Bahari hali

Moderate waves taking longer form, many whitecaps, some spray

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

Upepo wa nguvu 6 - Strong Breeze

Athari kwa nchi

Larger tree branches moving, whistling in wires

Bahari hali

Larger waves , whitecaps common, more spray

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

Upepo wa nguvu 7 - Near Gale

Athari kwa nchi

Whole trees moving, resistance felt walking against wind

Bahari hali

Sea heaps up, waves , white foam streaks off breakers

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

Upepo wa nguvu 8 - Gale

Athari kwa nchi

Whole trees in motion, resistance felt walking against wind

Bahari hali

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

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

Upepo wa nguvu 9 - Strong Gale

Athari kwa nchi

Slight structural damage occurs, slate blows off roofs

Bahari hali

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

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

Upepo wa nguvu 10 - Storm

Athari kwa nchi

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

Bahari hali

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

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

Upepo wa nguvu 11 - Violent Storm

Athari kwa nchi

Widespread devastation

Bahari hali

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

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

Upepo wa nguvu 12 - Hurricane

Athari kwa nchi

Considerable destruction

Bahari hali

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

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