Wind Speeds

Level	Windspeed (mph)	Windspeed (m/s)	Description
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