Land Beaufort Scale
The Beaufort scale was long in use as a system for estimating wind speeds. It was introduced in 1806 by Admiral Sir Francis Beaufort (1774-1857) of the British navy to describe wind effects on a fully rigged man-o-war sailing vessel, and it was later extended to include descriptions of effects on land features as well.
Force Speed (mph) Indicators
0 0 Smoke rises vertically break out a no wind glider
1 1 - 3 Smoke drift indicates wind direction ultra light sport kite
2 4 - 7 Wind felt on face; leaves rustle ideal for sport kites
3 8 - 12 Leaves, small twigs in constant motion any thing will fly
4 13 - 18 Dust and leaves raised up, branches move reaching the top end
5 19 - 25 Small trees begin to sway time to start packing up
6 26 - 31 Large branches of trees in motion time to take up chess
