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Historically, the Beaufort wind force scale
provides an empirical description of wind speed based on observed sea
conditions. Originally it was a 13-level scale, but during the 1940s,
the scale was expanded to 17 levels.[17]
There are general terms that differentiate winds of different average
speeds such as a breeze, a gale, a storm, tornado, or a hurricane.
Within the Beaufort scale, gale-force winds lie between 28 knots
(52 km/h) and 55 knots (102 km/h) with preceding adjectives such as
moderate, fresh, strong, and whole used to differentiate the wind's
strength within the gale category.[18]
