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Below is a wind chart, created in 1805 by Admiral Beaufort of the British Navy. Beaufortarranged the numbers 0 to 12 to indicate the strength of the windfrom calm (force 0) to hurricane (force12). Here’s a wind force scaleadapted 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