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Wind Speed: 4-6 knots (4-7 mph or 2-3 m/s) Observational Conditions: Light breeze, wind felt on face, leaves rustle

Wind Speed: 22-27 knots (25-31 mph or 11-14 m/s) Observational Conditions: Strong breeze, large branches in motion, whistling heard in wires

Wind Speed: 1-3 knots (1-3 mph or 0.5-1.5 m/s) Observational Conditions: Light air, smoke drift indicates wind direction

Wind Speed: < 1 knot (< 1 mph or < 0.5 m/s) Observational Conditions: Calm, smoke rises vertically

Wind Speed: 28-33 knots (32-38 mph or 14-17 m/s) Observational Conditions: Moderate gale, whole trees in motion, inconvenience felt walking against wind

Wind Speed: 48-55 knots (55-63 mph or 25-28 m/s) Observational Conditions: Storm, trees uprooted, considerable structural damage occurs

Wind Speed: 7-10 knots (8-12 mph or 3.5-5 m/s) Observational Conditions: Gentle breeze, leaves and small twigs in constant motion

Wind Speed: 17-21 knots (19-24 mph or 9-11 m/s) Observational Conditions: Fresh breeze, small trees in leaf begin to sway

Wind Speed: 41-47 knots (47-54 mph or 21-24 m/s) Observational Conditions: Strong gale, slight structural damage occurs, slate blown from roofs

Wind Speed: 34-40 knots (39-46 mph or 17-21 m/s) Observational Conditions: Fresh gale, twigs broken from trees, vehicles veer on road

Wind Speed: 11-16 knots (13-18 mph or 6-8 m/s) Observational Conditions: Moderate breeze, dust and loose paper raised, small branches move

Wind Speed: 56-63 knots (64-72 mph or 29-32 m/s) Observational Conditions: Violent storm, widespread damage, very rarely experienced on land