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Douglas Harper's Etymology Dictionary
Beaufort scale

to measure wind velocity, developed 1806 by Francis Beaufort (1774-1857), surveyor and hydrologist.

Wiktionary
beaufort scale

n. (context nautical English) An empirical measure for the intensity of the wind based mainly on the state of the sea or wave conditions.

Wikipedia
Beaufort scale

The Beaufort scale is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale.

Usage examples of "beaufort scale".

A scream means the wind is around Force 9 on the Beaufort Scale, forty or fifty knots.

Wind strength was recorded as northerly 32 knots, which is almost gale force 8 on the Beaufort scale.

In the lift I decided that the Beaufort scale was at least eight, more likely nine.

The wind was fairly steady, about Force 9 on the Beaufort scale, and the snow had stopped.

There were a hundred days when the U-boats reported winds topping force 7 on the Beaufort scale.