ABSTRACTS 



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METEOROLOGY.— r«/?;es of storms of the United States and their 

 average movements. Edward H. Bowie, and R. Hanson Weight- 

 man. Washington, 1914, 37 pages; 114 charts (U. S. Weather 

 Bureau, Monthly Weather Review, Supplement No. I). 



The authors have classed the storms (lows) of the United States 

 according to their point of apparent origin. In this classification they 

 have wisely followed the geographic divisions adopted by an earlier 

 investigator of the subject. 



The period covered includes the twenty-one years 1892-1912, and 

 the total number of lows considered was 2597. The authors have 

 departed from the traditional way of portraying storm paths. In- 

 stead of indicating by a single continuous line the average path of a 

 group of storms they have taken as the geographic unit of movement 

 the successive five-degree squares across the country, from the Pacific 

 to the Atlantic, and have computed for each five-degree square the 

 mean direction and 24-hour travel, based on the total number of lows 

 of the group under consideration that temporarily occupied the square 

 during the entire period. The results have been expressed by a series 

 of arrows, one for each square. Each arrow shows, first, the number 

 of lows that have temporarily occupied the square, and upon which 

 the computations have been based; second, the mean direction and 

 24-hour travel of the lows, the length of the arrows being proportional 

 to the average number of miles covered by the lows. Notwithstanding 

 the very large number of lows used, not a few squares are represented 

 by less than five lows, but such deficiency is incident to a work of this 

 character, especially in those regions where lows pertaining to a certain 

 group seldom penetrate. 



The advantage of this system lies in the fact that it shows at a glance 



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