15 r 



30% 



THOUSANDS 

 OF FEET 



48 7o 



PERCENTAGE 

 OF FREQUENCY 



Figure 3-4. — Winter winds at Point Barrow. 



Summer brings the greatest departure from the polar anticy- 

 clonic wind pattern at Point Barrow. At the surface, easterly- 

 winds still prevail but a secondary maximum of greatest frequency 

 exists from the west to southwest. Aloft the direction of greatest 

 frequency becomes southwest to west from 3,000 to 10,000 feet. 

 At 13,000 feet there is no particular quadrant of greatest fre- 

 quency, except that the greatest percentage of wind has a westerly 

 component. At 13,000 feet those winds having the greatest west- 

 erly component are the strongest, reaching about 22 m. p. h. The 

 easterly winds have the least velocity. Easterly winds are again 

 predominant in the fall, however, with 58 percent of the surface 

 wind coming from the east-northeast to the southeast at 16 m. p., h. 

 At 3,000 and 6,000 feet those winds having the greatest frequency, 

 accounting for 45 percent of the total, are from east-northeast 

 to southeast with an average velocity of 24 m. p. h. At 10,000 

 feet the dominance of easterly winds is less pronounced, while at 

 13,000 feet there is a small weight of prevalence in favor of west 

 to northwest winds at 21 m. p. h. 



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105 



