42 



being much farther south than the others is to be found when refer- 

 ence is made to the daily weather maps. An anticyclone of consid- 

 erable strength spread southward out of the region north of the 

 St. Lawrence River and probably tended to push cyclone C farther 

 south than it would otherwise have traveled. 



The next most striking weather feature in June was the increased 

 number of cyclone families which bred in central North America 

 and persisted in occupying pretty much all of the region northward 

 of a front that extended from the Great Lakes to east of New- 

 foundland. 



PERSISTENCY OF A DEPRESSION IN THE REGION EAST OF 



NEWFOUNDLAND 



Many times during the spring of 1926 we observed that the region 

 immediately east of Newfoundland, and often the Newfoundland 

 area itself, was for days the seat of a deficiency of atmospheric pres- 

 sure. This persisted so markedly that the phenomenon is regarded 

 not simply as a peculiarity of one season but rather as a general 

 characteristic of all years. As an illustration of the manner in which 

 individual depressions (or a permanent general depression?) may 

 persist in a given region we point to the meteorological maps from 

 8 a. m. April 15 to 8 a. m. of the 19th during which time the pressure 

 in the Newfoundland theater was constantly lower than that sur- 

 rounding it to the west and south. The fact that there are observa- 

 tion stations on these three sides of Newfoundland permits one to 

 construct an accurate isobaric map, but it docs not throw any infor- 

 mation whatsoever on conditions in process in the quarter northeast 

 of Newfoundland. It is easy to see then that we are unable to fLx the 

 position of storm centers after they have reached this vicinity, and 

 therefore when we continue to receive reports of low barometer read- 

 ings from St. Johns it is a natural tendency to conclude the cyclone 

 has paused in its northeasterly progress, but the truth of this opinion 

 is open to question. It may be clearer to regard a series of monthly 

 mean pressure maps of the entire North Atlantic, which over a series 

 of years will reveal the presence of a mammoth depression central 

 near Iceland. It is believed that the continual presence of a depres- 

 sion observed east of Newfoundland on the ice patrol weather maps 

 is in reality the western influence of the great Icelandic minimum 

 accentuated by convergence while crossing Newfoundland of indi- 

 vidual North American cyclone centers. 



THE STRUCTURE OF A STORM AND ITS PROBABLE PATH 



It may be instructive to devote a few very brief remarks to the 

 new ideas in meteorology on the structure of cyclones (storm depres- 

 sions) and their probable lanes of travel. Forecasters in the past 



