Beaufort Wind Scale Table

**Beaufort Wind Scale**
Beaufort No.	Description of wind	Observation	Wind speed-mph	Wind speed-ft/min	Wind speed-m/s
0	Calm	Smoke rises vertically	0–0.3	0–25	0–0.15
1	Light air	Direction of wind shown by smoke drift but not by wind vanes	0.3–6	25–525	0.15–2.7
2	Light breeze	Wind felt on face; leaves rustle; ordinary vanes moved by wind	6–8	525–700	2.7–3.6
3	Gentle breeze	Leaves and small twigs in constant motion; wind extends light flag	8–16	700–1400	3.6–7.2
4	Moderate breeze	Raises dust and loose paper; small branches moved	16–20	1400–1800	7.2–8.9
5	Fresh breeze	Small trees in leaf begin to sway	20–28	1800–2500	8.9–12.5
6	Strong breeze	Large branches in motion; whistling heard in telegraph wires	28–32	2500–2800	12.5–14.5
7	Moderate gale	Whole trees in motion; inconvenience felt when walking into wind	32–44	2800–3900	14.5–20
8	Gale	Twigs broken off trees; generally impedes progress	44–50	3900–4400	20–22
9	Strong gale	Slight structural damage, e.g. slates and chimney pots removed from roofs	50–62	4400–5450	22–28
10	Storm	Trees uprooted; considerable structural damage	62–70	5450–6150	28–31
11	Violet storm	Widespread damage	70–82	6150–7200	31–37
12	Hurricane		>82	>7200	>37