Beaufort | MPH | Description | Effects |
0 | 0 | Calm | Smoke rises vertically. |
1 | 1 - 3 | Light Air |
Smoke will show a slight direction. A wind vane will not move. |
2 | 4 - 7 | Light Breeze |
You will feel a breeze on your face. Smoke has a definite direction. Leaves move a bit. A wind vane will move. |
3 | 8 - 12 | Gentle Breeze |
Leaves will be in constant motion. Small twigs move. Flags extend. |
4 | 13 - 18 | Moderate Breeze |
Dust puffs blow. Loose paper flies. 1/2 to 1 inch branches move. |
5 | 19 - 24 | Fresh Breeze |
Small leafy trees sway. Small waves form on ponds and lakes. Flags whip. |
6 | 25 - 31 | Strong Breeze |
4 inch and larger branches moving. Telephone, power lines whistle. |
7 | 32 - 38 | Near Gale |
Large, whole trees in motion. Becomes hard to walk totally upright against the wind. Shingles begin to lift. |
8 | 39 - 46 | Gale |
Green twigs begin to break off. You may have to lean into wind to walk. Shingles flap violently. |
9 | 47 - 54 | Severe Gale |
3 inch or larger green branches break. Chimneys and shingles begin to tear off. TV antenna masts bend and antennas are broken. |
10 | 55 - 63 | Storm |
Trees begin to uproot. Structural damage starts getting serious. Large sections of roofs and roofing tear off and fly. Some mobile homes begin to suffer damage. Walking nearly impossible. |
11 | 64 - 72 | Violent Storm |
Structural damage widespread and major. Mobile homes are displaced and skins peel. Entire roofs blow off and windows blow in. |
12 | 72+ | Hurricane | Now into the realms of tornadoes and the S1 to S5 tornado ratings. |
Howhill Weather - Graphs | Updated: Thu 8 Jan 2009, 00:00 GMT |