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BEAUFORT WIND STRENGTH SCALE

 This scale gauges wind speed through the use of observations of the winds effects on trees and other objects. It is often used in monitoring projects because it is simple to understand and does not require specialized equipment. 

 Example: A "light breeze" is recorded as "2B" in the appropriate section of the spray diary.

 

B. No

 

Approx Speed

 

Classification and Description

 

 

0

 

< 2 km/h

 

Calm

 

Still, smoke will rise vertically.

 

1

 

2 to 5 km/h

 

Light Air

 

Rising smoke drifts, weather vane is inactive.

 

 

2

 

5 to12 km/h

 

Light Breeze

 

Leaves rustle, can feel wind on your face, weather vane is active.

 

 

3

 

12 to 20 km/h

 

Gentle Breeze

 

Leaves and twigs move around. Light weight flags extend.

 

 

4

 

20 to 30 km/h

 

Moderate Breeze

 

Thin branches move around, raises dust and paper.

 

 

5

 

30 to 40 km/h

 

 

Fresh Breeze

 

Trees move and sway.

 

This site is maintained by Senior Viticulturist.

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