Beaufort 0: Calm (Stille)
Wind velocity: 0 - 1 knot (0.0 - 0.52 m/s)
Sea like a mirror.
Beaufort 1: Light Airs (Flau vind)
Wind velocity: 1 - 3 knots (0.52 - 1.80 m/s)
Ripples with the appearence of scales are formed, but without
foam crests.
Beaufort 2: Light Breeze (Svak vind)
Wind velocity: 4 - 6 knots (1.80 - 3.35 m/s)
Small wavelets, short but pronounced; crests have a glossy
appearance, but do not break.
Beaufort 3: Gentle Breeze (Lett bris)
Wind velocity: 7 - 10 knots (3.35 - 5.41 m/s)
Large wavelets, crests begin to break. Foam of glossy
appearance. Perhaps scattered white horses.
Beaufort 4: Moderate Breeze (Laber bris)
Wind velocity: 11 - 16 knots (5.41 - 8.50 m/s)
Small waves, becoming longer; fairly frequent white horses.
Beaufort 5: Fresh Breeze (Frisk bris)
Wind velocity: 17 - 21 knots (8.50 - 11.07 m/s)
Moderate waves, taking a more pronounced long form; many
white horses are formed. Chance of some spray.
Beaufort 6: Strong Breeze (Liten kuling)
Wind velocity: 22 - 27 knots (10.07 - 14.16 m/s)
Large waves begin to form; the white foam crests are more
extensive everywhere. Probably some spray.
Beaufort 7: Near Gale (Stiv kuling)
Wind velocity: 28 - 33 knots (14.16 - 17.25 m/s)
Sea keeps up and white foam from breaking waves begins to
be blown in streaks along the direction of the wind.
Spindrift begins to be seen.
Beaufort 8: Gale (Sterk kuling)
Wind velocity: 34 - 40 knots (17.25 - 20.86 m/s)
Moderately high waves of greater length; edges of crests
break into spindrift. The foam is blown in well marked
streaks along the direction of the wind. Spray affects visibility.
Beaufort 9: Strong Gale (Liten storm)
Wind velocity: 41 - 47 knots (20.86 - 24.46 m/s)
High waves. Dense streaks of foam along the direction of the
wind. Sea begins to roll. Visibility affected.
Beaufort 10: Storm (Full storm)
Wind velocity: 48 - 55 knots ( 24.46 - 28.58 m/s )
Very high waves with long overhanging crests. The resulting
foam is in great patches and is blown in dense white streaks
along the direction of the wind. On the whole of the surface
the sea takes a white appearence. The rolling of the sea
becomes heavy and shock-like. Visibility is affected.
Beaufort 11: Violent Storm (Sterk storm)
Wind velocity: 56 - 63 knots (28.58 - 32.70 m/s)
Exceptionally high waves. Sea completely covered with long
white patches of foam lying in direction of wind. Everywhere
edges of wave crests are blown into fret. Visibility affected.
Beaufort 12: Hurricane (Orkan)
Wind velocity: more than 64 knots (more than 32.70 m/s)
Air filled with foam and spray. Sea white with driving spray;
visibility very seriously affected.