| Eye Color/Pulse |
Beaufort Force |
Knots |
mph |
Sea Conditions |
| Slow On/Off Pulse |
Force 0 |
0 - 1 |
Calm
0 - 1.7 |
Glassy-smooth, Mirror-like |
| Violet with 1 Blue Pulse |
Force 1 |
2 - 3 |
Light Air
1.8 - 4 |
Scale-like ripples |
| Indigo with 2 blue pulses |
Force 2 |
4 - 6 |
Light Breeze
4.1 - 7.4 |
Small, short wavelets with glassy crests |
| Blue with 3 green pulses |
Force 3 |
7 - 10 |
Gentle Breeze
7.5 - 12 |
Large wavelets, crests begin to break |
| Green with 4 yellow pulses |
Force 4 |
11 - 16 |
Moderate Breeze
12.1 - 18.9 |
Small waves, some whitecaps |
| Yellow with 5 orange pulses |
Force 5 |
17 - 21 |
Fresh Breeze
19 - 24.7 |
Moderate longer waves, better formed with many whitecaps, much foam, some spray |
| Orange with 6 red pulses |
Force 6 |
22 - 27 |
Strong Breeze
24.8 - 31.6 |
Large waves form, many whitecaps, foam everywhere, more spray |
| Red with 7 white pulses |
Force 7 |
28 - 33 |
Moderate Gale
31.7 - 38.5 |
Sea heaps up, streaks of foam, spindrift begins |
