Beaufort Scale
From LoveToKnow 1911
| Beaufort scale. | Corresponding wind. | Limits of hourlyvelocity. |
| Numbers. | Miles per hour. | |
| o | Calm | Under 2 |
| 1-3 | Light breeze | 2-12 |
| 4-5 | Moderate wind | 13-23 |
| 6-7 | Strong wind | 24-37 |
| 8-9 | Gale | 38-55 |
| io-i | Storm | 56-75 |
| 12 | Hurricane | Above 75 |
BEAUFORT SCALE, a series of numbers from o to 12 arranged by Admiral Sir Francis Beaufort (1774-1857) in 1805, to indicate the strength of the wind from a calm, force o, to a hurricane, force 12, with sailing directions such as "5, smacks shorten sails" for coast purposes, and "royals, &c., ` full and by '" for the open sea. An exhaustive report was made in 1906 by the Meteorological Office on the relation between the estimates of wind-force according to Beaufort's scale and the velocities recorded by anemometers belonging to the office, front which the following table is taken: -
