Developed in 1805 by Sir Francis Beaufort
0- Calm: Silent; smoke rises vertically.
1- Light Air: Direction of wind shown by smoke drift.
2- Light Breeze: Wind felt on face; leaves rustle.
3- Gentle Breeze: Leaves and small twigs in constant motion; wind extends light flag.
4- Moderate Breeze: Raises dust and loose paper; small branches are moved.
5- Fresh Breeze: Small trees in leaf begin to sway;
6- Strong Breeze: Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty.
7- Near Gale: Whole trees in motion; inconvenience felt when walking against the wind.
8- Gale: Breaks twigs off trees; generally impedes progress.
9- Severe Gale: Slight structural damage occurs, chimney-pots and slates removed.
10- Storm: Seldom experienced inland; trees uprooted; considerable structural damage occurs.
11- Violent Storm: Very rarely experienced; accompanied by wide-spread damage.
12- Hurricane: A giant sucking sound occurs, the end of the Bush presidency.