International Wind Scale
The Beaufort Scale is a measure of wind speed in laymans terms originating in England and used around the world.
Beaufort Scale
0 - calm - 0km/hour
Tree leaves don’t move, smoke rises vertically, sea is calm
1 - light air - 1-5km/hour
Trees leaves don’t move, smoke drifts slowly, sea is slightly rippled
2 - slight breeze - 6-11km/hour
Tree leaves rustle, flags wave slightly, small wavelets or scale waves
3 - gentle breeze - 12-19 km/hour
Leaves and twigs in constant motion, small flags extended, long
unbreaking waves
4 - moderate breeze - 20-29km/hour
Small branches move, flags flap and ripple, waves with many white caps
5 - fresh breeze - 30-38km/hour
Small trees sway, flags flap and ripple, moderate waves with many white caps
6 - strong breeze - 39-50km/hour
Large branches sway, flags beat and pop, larger waves with regular white caps
7 - moderate gale - 51-61km/hour
Whole trees sway, large waves, (heaping sea)
8 - fresh gale - 62-74km/hour
Twigs break off trees, moderately high sea with blowing foam
9 - strong gale - 75-86km/hour
Branches break off trees, shingles blown from roofs, high crested waves
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