ΕΜΥ, Εθνική Μετεωρολογική Υπηρεσία - Δελτία Καιρού, Προγνώσεις

Beaufort Scale

Force Description
Specification
Equivalent speed in Knots Equivalent speed in m/sec Equivalent speed in Km/h Probale wave height in m (max)
0 Calm Sea like a mirror 00 0-0,2 01  
1 Light Air Ripples with the appearance of scales are formed, but without foam crests. 01-03 0,3-1,5 01-05 0,1(0,1)
2 Light breeze Small wavelets, still short, but more pronounced. Crests have a glassy appearance and do not break. 04-06 1,6-3,3 06-11 0,2(0,3)
3 Gentle Large wavelets. Crests begin to break. Foam of glassy appearance. Perhaps scattered white horses. 07-10 3,4-5,4 12-19 0,6(1)
4 Moderate Small waves, becoming larger; fairly frequent white horses. 11-16 5,5-7,9 20-28 1(1,5)
5 Fresh Moderate waves, taking a more pronounced long form; many white horses are formed. Chance of some spray. 17-21 8,0-10,7 29-38 2(2,5)
6 Strong Large waves begin to form; the white foam crests are more extensive everywhere. Probably some spray. 22-27 10,8-13,8 39-49 3(4)
7 Near Gale Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind. 28-33 13,9-17,1 50-61 4(5,5)
8 Gale Moderately high waves of greater length; edges of crests begin to breakinto spindrift. The foam is blown in well-marked streaks along the direction of the wind. 34-40 17,2-20,7 62-74 5,5(7,5)
9 Strong gale High waves. Dense streaks of foam along the direction of the wind. Crests of waves begin to topple, tumble and roll over. Spray may affect visibility. 41-47 20,8-24,4 75-88 7(10)
10 Storm Very high waves with long over-hanging crests. The resulting foam, in great patches, is blown in dense white streaks along the direction of the wind. On the whole the surface of the sea takes on a white appearance. The 'tumbling' of the sea becomes heavy and shock-like. Visibility affected. 48-55 24,5-28,4 89-102 9(12,5)
11 Violent Exceptionally high waves (small and medium-size ships might be for a time lost to view behind the waves). The sea is completely covered with long white patches of foam lying along the direction of the wind. Everywhere the edges of the wave crests are blown into froth. Visibility affected. 56-63 28,5-32,6 103-117 11,5(16)
12 Hurricane The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected. 64 and more 32,7 and more 118 and more 14(-)