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Nov 18, 2014, 09:08 AM
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Beaufort Scale for Wind Speed


Beaufort Scale for Wind Speed Estimation

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The Beaufort Wind Scale is named after Sir Francis Beaufort, an admiral in the British Navy. He developed the scale in 1805 in order to estimate wind speed by noting how sails move in the wind. It turned out to be a great help and was later adapted for use on land.

Force 0
Strength: Calm
Speed: Less than 1 mile per hour (mph), less than 2 kilometers per hour (kph)
Observations: Tree leaves don't move, smoke rises vertically

Force 1
Strength: Light Air
Speed: 1-3 mph, 2-6 kph
Observations: Tree leaves don't move, smoke drifts slowly

Force 2
Strength: Slight Breeze
Speed: 4-7 mph, 7-11 kph
Observations: Tree leaves rustle, flags wave slightly

Force 3
Strength: Gentle Breeze
Speed: 8-12 mph, 12-19 kph
Observations: Leaves and twigs in constant motion, small flags extended

Force 4
Strength: Moderate Breeze
Speed: 13-18 mph, 20-29 kph
Observations: Small branches move, flags flap

Force 5
Strength: Fresh Breeze
Speed: 19-24 mph, 30-39 kph
Observations: Small trees sway, flags flap and ripple

Force 6
Strength: Strong Breeze
Speed: 25-31 mph, 40-50 kph
Observations: Large branches sway, flags beat and pop

Force 7
Strength: Moderate Gale
Speed: 32-38 mph, 51-61 kph
Observations: Whole trees sway

Force 8 - Force 12
RC Operations grounded
Also see Flying RC Planes in the Wind, click here
Last edited by Red.Sneakers; Apr 20, 2015 at 12:41 PM. Reason: update
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