[at-l] Beaufort (Wind Force) Scale (Land).

[WHHAWKINS@aol.com]

This is the Beaufort (Wind Force) Scale for use on land.

Wildbill
            
            
The Beaufort number is often referred to as a "Force Number", say "Force        
    
5 Fresh Breeze". At sea, small craft advisories are usually issued when         
    
force 6 is reached.         
            
Wind Force US / UK Name
in beaufort  of Wind Force  Effects on Land-Effects                         
MPH
0           Calm            Still, smoke will rise vertically.              0
1           Light Air       Rising smoke drifts; weather 
                            vane is inactive.                               
1-3

2           Light Breeze    Leaves rustle, can feel wind on 
                            your face, ordinary vane moved by wind.     4-5

3           Gentle Breeze   Leaves and twigs move around, 
                            light weight flags extend.                  8-12

4           Moderate 
            Breeze          Moves thin branches, raises dust and paper. 13-18

5           Fresh Breeze    Small trees in leaf begin to sway, 
                            crested wavelets form on inland waters.     19-24

6           Strong Breeze   Large tree branches move, open wires 
                            (such as telegraph wires) begin to "whistle", 
                            umbrellas are difficult to keep under control.   
25-31

7           Moderate Gale 
            / Near Gale     Large trees begin to sway, noticeably 
                            difficult to walk.                              
32-38

8           Fresh Gale
            / Gale          Twigs and small branches are broken from
                            trees, walking into the wind is very difficult. 
39-46

9           Strong Gale     Slight damage occurs to buildings, shingles
                            are blown off of roofs.                     47-54

10          Whole Gale 
            / Storm         Large trees are uprooted, building damage 
                            is considerable, seldom inland.             55-63

11          Storm/ 
            Violent Storm   Extensive widespread damage, 
                            very rarely inland.                         64-72

12 (- 17)   Hurricane       Extreme destruction.                        above 
72
            
            
            
            
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