The Beaufort Scale

The Beaufort Scale is an empirical scale designed to describe wind speed based on the observed appearance of the sea. Its full name is the Beaufort Scale of wind force. Wind speed can be precisely measured with an anemometer and expressed in meters per second, kilometers per hour or knots. But and an estimate of wind speed with just one observation of the effects of wind on the sea would have been even more useful. This was accomplished in 1805 when Admiral Francis Beaufort (1774-1857) developed a very precise scale for assessing wind speed, scale, which allowed gave better information to the navy. Subsequently, characteristics were added in order to estimate the wind force on the ground.

The Beaufort scale has 12 degrees. Estimating the degree of wind power for the average wind speed is calculated for a period of 10 minutes and wind speeds are measured at a height of 10 meters above the ground. In this sense, the estimation of powerful winds on the Beaufort scale is improper. The symbol of an unit on the Beaufort scale is "BF".

Formula that can calculate the degree depending on the Beaufort wind speed v, expressed in km/h is:

Beaufort Formula

The result shall be rounded to the nearest whole number. This formula applies to wind speeds up to 118 km / h, above which is becomes inaccurate.

Source: Wikipedia