46 



April this year; May, however, there was about double the normal 

 amount, and June proved to be just about normal. A table showing 

 montlily records of fog, fog and low visibility, gales, and calms 

 for the 1927 ice season is shown below: 



Month 



April 



May 



June .' 



1 Based on 12-hour periods. 



Percentage (hours) 



Fog 



Low 



visibility 



Gales 

 (number 

 of days) 



Winds 



(average 



force) 



3.6 

 3.3 

 3.7 



Calms 

 (num- 

 ber)! 



so- 



-70- 

 60 

 50 

 40 



I- 



Z 

 y 

 



b^ 30 

 u 



a. 



^0 

 10 



oL 



I 





APRIL 



MAV 



June: 



Fig. 12. 



-The monthly percentages of fog around the tail of the Grand Bank during the ice season of 1927, 

 and as compared with normal 



Figure 12 shows the monthly percentages of fog which was observed 

 by the patrol around the Tail of the Grand Banks during the ice 

 season of 1927. The percentage of fog that envelops the ice regions 

 is always a subject of vital interest, since, obviously, fog and low 

 visibility greatly magnify the danger of collision with icebergs. 



COOPERATION WITH THE UNITED STATES WEATHER BUREAU 



Following the procedure on previous patrols a meteorological map 

 was constructed twice daily on board ship, the data being obtained 

 from the general synoptic reports broadcasted by the United States 



