The Beaufort scale, which is used in Met Office marine forecasts, is an The official term is Strong gale, however, the Met Office uses the. Scale, Force Rating, Observable Land Effects, Speed MPH, Effect at sea. 0, Calm, Vertical Smoke 7, Moderate Gale, Trees sway, , Rough to very rough. A gale is a very strong wind. There are conflicting definitions of how strong a wind must be to be On the Beaufort Wind Scale, a gale is classified as: 7: Moderate Gale (32–38 miles per hour), 8: Fresh Gale ( mph), 9: Strong Gale (.
Gale scale Video