| SPEED (mph) | BEAUFORT WIND SPEED EVALUATION CHART | 0 | Smoke rises vertically |
|---|---|
| 1 - 3 | Direction of wind shown by smoke drift but not by wind vanes |
| 4 - 7 | Wind felt on face, leaves rustle, ordinary wind vane moved by wind |
| 8 - 12 | Leaves and small twigs in motion, light flags extended |
| 13 - 18 | Dust raised, loose paper raised, small branches move |
| 19 - 24 | Small leafy tress sway, crested wavelets form on lakes and ponds |
| 25 - 31 | Large branches in motion, whistling in telephone wires or link fences |
| 32 - 38 | Whole trees in motion, inconvenience felt walking against wind |
| 39 - 46 | Twigs break off trees, impedes progress walking |
| 47 - 54 | Small branches break off dead or diseased trees |
| 55 - 63 | Slight structural damage (chimneys and shingles), branches break off healthy trees with leaves |
| 64 - 72 | Large branches of trees broken off, trees with leaves uprooted, structural damage mostly to roofs |
| 73+ | Damage to structures major and widespread, many roofs and windows damaged |