Table D-3 - Beaufort Scale of Wind Velocities 







Terms used in 











Weather Bureau 



(Statute Miles 





Scale 



Des'crfption 

 Calm 



Forecasts 



per hour) 



(knots) 







0-3 



- 2.6 



1 



Light Air 



Light 



8 



6.9 



2 



Light Breeze 





13 



11.3 



3 



Gentle Breeze 



Gentle 



18 



15.6 



h 



Moderate Breeze 



Moderate 



23 



20 



5 



Fresh Breeze 



Fresh 



28 



2U.3 



6 



Strong Breeze 



Strong 



3U 



29.5 



7 



Moderate Gale 



Uo 



3U.7 



8 



Fresh Gale 



Gale 



U8 



Ul.6 



9 



Strong Gale 





56 



U8.6 



10 



Whole Gale 



Whole 



65 



56.U 



11 



Storm 



Gale 



75 



65.1 



12 



Hurricane 



Hurricane 



90 and over 



78.1 and < 



Table 



D-li - Scale Showing State 



Table D-5 



- Douglas Sea Scale Show- 





of Sea 







ing Character of Sea Swell 



Scale 



Description 



Height of Wave 

 feet 



Scale 







Description 

 None 







Calm 



0-1 



1 



Low - short or average 



1 



Smooth 



1-2 



2 



Low - long 



2 



Slight 



2 - 3 



3 



Moderate - short 



3 



Moderate 



3 - 5 



U 



Moderate - average 



h 



Rough 



5 - 8 



5 



Moderate - long 



5 



Very rough 



8-12 



6 



Heavy - short 



6 



High 



12-20 



7 



Heavy - average 



7 



Very high 



20 - Uo 



8 



Heavy - long 



8 



Precipitous 



Uo up 



9 



Confused 



9 



Confused 



Record chief 

 direction 







D-25 



