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☝🏻 The Beaufort wind scale is a system used to estimate and report wind speeds when no measuring apparatus is available. It was invented in the early 19th Century by Admiral Sir Francis Beaufort of the British Navy as a way to interpret winds from conditions at sea. Since that time, the scale has been modernized for effects on land.
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| Beaufort Force | Velocity (knots) | Indication |
|---|---|---|
| 0 | less than 1 | smoke rises vertically |
| 1 | 1 – 3 | wind blows smoke |
| 2 | 2 – 7 | wind felt on face |
| 3 | 8 – 12 | leaves in motion |
| 4 | 13 – 18 | raises dust and loose paper |
| 5 | 19 – 24 | sways small trees |
| 6 | 25 – 31 | moves large branches of trees |
| 7 | 32 – 38 | whole trees in motion |
| 8 | 39 – 46 | breaks twigs off of trees |
| 9 | 47 – 54 | slight structural damage |
| 10 | 55 – 63 | uproots trees |
| 11 | 64 – 72 | widespread damage |
| 12 | 73 – 136 | devastation |