Wind Speeds

0 — Calm less than 1 mph
(0 m/s)		 Smoke rises vertically
1 — Light air 1 – 3 mph
0.5-1.5 m/s		 Smoke drifts with air, weather vanes inactive
2 — Light breeze 4 – 7 mph
2-3 m/s		 Weather vanes active, wind felt on face, leaves rustle
3 — Gentle breeze 8 – 12 mph
3.5-5 m/s		 Leaves & small twigs move, light flags extend
4 — Moderate breeze 13 – 18 mph
5.5-8 m/s		 Small branches sway, dust & loose paper blows about
5 — Fresh breeze 19 – 24 mph
8.5-10.5 m/s		 Small trees sway, waves break on inland waters
6 — Strong breeze 25 – 31 mph
11-13.5 m/s		 Large branches sway, umbrellas difficult to use
7 — Moderate gale 32 – 38 mph
14-16.5 m/s 		Whole trees sway, difficult to walk against wind
8 — Fresh gale 39 – 46 mph
17-20 m/s		 Twigs broken off trees, walking against wind very difficult
9 — Strong gale 47 – 54 mph
20.5-23.5 m/s		 Slight damage to buildings, shingles blown off roof
10 — Whole gale 55 – 63 mph
24-27.5 m/s		 Trees uprooted, considerable damage to buildings
11 — Storm 64 – 73 mph
28-31.5 m/s 		Widespread damage, very rare occurrence
12 — Hurricane over 73 mph
over 32 m/s 		Violent destruction