966 



BULLETIN OF THE BUEEAU OF FISHERIES 



Average percentage of. winds from each direction {10 years , 1911 to 1920} — Continued 



YAEMOXJTH, NOVA SCOTIA 



Month 



January 



February 



March _ 



April 



May - 



June - 



July... 



August 



September 



October 



November 



December 



Average for 3 winter months .. 

 Average tor 3 summer months 

 Average for year.. 



North 



North- 

 east 



East 



South- 

 east 



South 



South- 

 west 



West 



North- 

 west 



Calm 



2 

 4 

 4 

 5 

 2 

 6 

 8 

 13 

 12 

 6 

 4 

 2 



These tables may be briefly summarized as follows: 



Along the western and northern shores of the gulf the wind blows most often 

 between southwest and north in winter, averaging about northwest. In summer 

 southwesterly and southerly winds prevail. On the eastern side of the gulf the 

 wind averages more westerly (south to northwest) in summer, northerly (between 

 northwest and northeast) in winter. Over the offshore waters of the gulf, where 

 the dii'ection of the wind is not so much influenced by the diurnal warming and 

 cooling of the land, the prevailing winds are between west and north (though with 

 frequent reversals) from November to April; between west and south from June to 

 August; more variable in late spring and again in early autumn. 



In summer, by theoretic expectation, winds of this character would tend to 

 produce a general drift of the surface water about 20° to 45° to the right of the 

 octant, north to northeast — i. e., toward the northeast and east. Thus, the prevail- 

 ing winds favor the general drift out from the western side of the gulf and eastward 

 across the southern part of the basin toward Nova Scotia, which prevails at that 

 season (p. 974). Striking Nova Scotia, this wind current would tend to bank up 

 against the coast, raising the level of the sea slightly. Thereupon hydrostatic 

 forces are brought into play, dynamically, against the wind; but any resultant 

 movement of the water out from the land being in turn deflected to the right by the 

 earth's rotation, a northerly drift might be expected to result along Nova Scotia, 

 and in this instance theoretic expectation agrees so well with the drifts of bottles 

 actually recorded that the prevaihng southwesterly winds of summer certainly 

 assist the surface drift from south to north, which characterizes the eastern side 

 of the gulf at that season, though as certainly ngt the only motive force for it. 



