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EmailBelow is a wind chart, created by Admiral Beaufort. Beaufort arranged the numbers 0 to 12 to indicate the strength of the wind from calm (force 0) to hurricane (force 12). Here's a scale adapted to land:
"Used Mostly at Sea but of Help to All Who Are Interested in the Weather"
| Beaufort Force | Description | When You See or Feel This Effect | Wind (mph) | Wind (km/h) |
| 0 | Calm | Smoke goes straight up | less than 1 | less than 2 |
| 1 | Light air | Wind direction is shown by smoke drift but not by wind vane | 1-3 | 2-5 |
| 2 | Light breeze | Wind is felt on the face; leaves rustle; wind vanes move | 4-7 | 6-11 |
| 3 | Gentle breeze | Leaves and small twigs move steadily; wind extends small flags straight out | 8-12 | 12-19 |
| 4 | Moderate breeze | Wind raises dust and loose paper; small branches move | 13-18 | 20-29 |
| 5 | Fresh breeze | Small trees sway; waves form on lakes | 19-24 | 30-39 |
| 6 | Strong breeze | Large branches move; wires whistle; umbrellas are difficult to use | 25-31 | 40-50 |
| 7 | Moderate gale | Whole trees are in motion; walking against the wind is difficult | 32-38 | 51-61 |
| 8 | Fresh gale | Twigs break from trees; walking against the wind is very difficult | 39-46 | 62-74 |
| 9 | Strong gale | Buildings suffer minimal damage; roof shingles are removed | 47-54 | 75-87 |
| 10 | Whole gale | Trees are uprooted | 55-63 | 88-101 |
| 11 | Violent storm | Widespread damage | 64-72 | 102-116 |
| 12 | Hurricane | Widespread destruction | 73+ | 117+ |
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