Beaufort
Scale
1st
Gasóga Mara Abhaich
The Beaufort Scale is used to
measure wind speed.
|
Beaufort
Force |
Windspeed
(Knots) |
Description |
Look at this
picture: What is the windforce? |
||
|
0 |
0 |
Calm |
Sea like
a mirror |
||
|
1 |
1 - 3 |
Light
Air |
Ripples
but without foam crests |
||
|
2 |
4 - 6 |
Light
Breeze |
Small
wavelets. Crests do not break. |
||
|
3 |
7 - 10 |
Gentle
Breeze |
Large
wavelets. Perhaps scattered white horses |
||
|
4 |
11 - 16 |
Moderate
Breeze |
Small
waves. Fairly frequent white horses. |
||
|
5 |
17 - 21 |
Fresh
Breeze |
Moderate
waves, many white horses |
||
|
6 |
22 - 27 |
Strong
Breeze |
Large waves
begin to form; white foam crests, probably spray |
||
|
7 |
28 - 33 |
Near
Gale |
Sea
heaps up and white foam blown in streaks along the direction of the wind |
||
|
8 |
34 - 40 |
Gale |
Moderately
high waves, crests begin to break into spindrift |
||
|
9 |
41 - 47 |
Strong
Gale |
High
waves. Dense foam along the direction of the wind. Crests of waves begin to
roll over. Spray may affect visibility |
||
|
10 |
48 - 55 |
Storm |
Very
high waves with long overhanging crests. The surface of the sea takes a white
appearance. The tumbling of the sea becomes heavy and shock like. Visibility
affected |
||
|
11 |
56 - 63 |
Violent
Storm |
Exceptionally
high waves. The sea is completely covered with long white patches of foam
lying in the direction of the wind. Visibility affected |
||
|
12 |
64+ |
Hurricane |
The air
is filled with foam and spray. Sea completely white with driving spray.
Visibility very seriously affected. |
