How to Measure Wind Speed: The Beaufort Wind Force Scale
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Below is a wind chart, created in 1805 by Admiral Beaufort of the British Navy. Beaufort arranged the numbers 0 to 12 to indicate the strength of the wind from calm (force 0) to hurricane (force 12). Here’s a wind force scale adapted to land.
“Used Mostly at Sea but of Help to All Who Are Interested in the Weather”
Wind Force Scale
||When You See or Feel This Effect
||Smoke goes straight up
||less than 1
||less than 2
||Wind direction is shown by smoke drift but not by wind vane
||Wind is felt on the face; leaves rustle; wind vanes move
||Leaves and small twigs move steadily; wind extends small flags straight out
||Wind raises dust and loose paper; small branches move
||Small trees sway; waves form on lakes
||Large branches move; wires whistle; umbrellas are difficult to use
||Whole trees are in motion; walking against the wind is difficult
||Twigs break from trees; walking against the wind is very difficult
||Buildings suffer minimal damage; roof shingles are removed
||Whole gale (Storm)
||Trees are uprooted
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