THE BEAUFORT SCALE
| FORCE | STRENGTH | WIND SPEED KM/H * | WIND SPEED MPH * | EFFECT |
| 0 | CALM | 0-1 | - | Smoke rises vertically. |
| 1 | LIGHT AIR | 1-5 | 1-3 | Smoke drifts. |
| 2 | SLIGHT BREEZE | 6-11 | 4-7 | Leaves rustle, weather vanes move, wind felt on face. |
| 3 | GENTLE BREEZE | 12-19 | 8-12 | Light flags unfurl, leaves and twigs on trees move steadily. |
| 4 | MODERATE BREEZE | 20-28 | 13-18 | Small branches move, loose dust and paper fly about. |
| 5 | FRESH BREEZE | 29-38 | 19-24 | Leafy shrubs and trees sway. |
| 6 | STRONG BREEZE | 39-49 | 25-31 | Big branches move, wind pulls umbrellas. |
| 7 | HIGH WIND | 50-61 | 32-38 | Trees sway, walkers push into the wind. |
| 8 | GALE | 62-74 | 39-46 | Twigs break off trees, walking is hard. |
| 9 | STRONG GALE | 75-88 | 47-54 | Shingles, slates, and branches are blown off. Slight building damage. |
| 10 | STORM | 89-102 | 55-63 | Serious building damage, trees uprooted. |
| 11 | VIOLENT STORM | 103-117 | 64-72 | Widespread damage, wild storm. |
| 12 | HURRICANE | ABOVE 117 | ABOVE 73 | Violent destruction of buildings & vehicles. |
| * KM/H = Kilometers per
hour MPH = Miles per hour |
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