'wind: Beaufort scale'
0Calmless than 1less than 1smoke goes straight up; sea like a mirror1Light air1-51-3smoke blows in the wind; sea ripples, but without foam crests2Light breeze6-114-6wind felt on the face; leaves rustle; small wavelets; wave crests have a glassy appearance and do not break3Gentle breeze12-197-10light flag flutters; leaves in constant motion; large wavelets; wave crests begin to break; scattered white horses4Moderate breeze20-2811-16dust and loose paper blown about; small branches move; small waves, becoming larger; white horses fairly frequent5Fresh29-3817-21small trees sway; moderate waves; white horses frequent6Strong39-4922-27hard to use umbrellas; large waves begin to form; white foam crests more extensive7Near gale50-6128-33hard to walk into; whole trees in motion; sea heaps up; white foam from breaking waves begins to be blown along the direction of the wind8Gale62-7434-40twigs break off trees; moderately high waves; edges of crests begin to break off into spindrift; foam is blown along the direction of the wind9Strong gale75-8841-47slates lost; high waves; crests of waves begin to topple, tumble and roll over; spray may affect visibility10Storm89-10248-55trees uprooted; considerable structural damage; very high waves; the surface of the sea takes on a white appearance; visibility affected11Violent storm103-11756-63widespread damage; exceptionally high waves; small and medium-size ships may be lost to view behind the waves; visibility affected12Hurricane118 and over64 and overviolent, massive damage; the air is filled with foam and spray; visibility very seriously affected ▷ See wind
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