4 E. Loomis— United States Weather Maps. 
on the left represents the isobaric line of 29°60; the oval imme- 
diately surrounding it is the isobaric line of 29°70; and the 
center of the storm was near the center of these two ovals. 
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The third and largest oval represents the limits of the rain area 
as far as can be determined from the signal service observations. 
The storm center advanced in the direction of the long arrow 
It will be noticed that the rain area extended on all sides 
around the storm center, but spread out most upon the eastern 
ide. The same is generally true of storms which pass over 
the United States. : 
er to determine whether there exists any connection be- 
tween the extent of this rain area and the Aoi of the storm’s 
progress, the rain-fall at each station for the preceding eight hours 
was copied from each of the weather maps in every case in which 
the storm path could be exactly traced for the next 24 hours; 
and the distance to which the rain area extended to the east of 
the storm center was measured upon the map. The whole 
investigation could be derived from the maps. 
Velocity in Velocity in 
miles per (Extentof don age Bo Extent ofrain 
hour. area in miles, hour. area in miles, 
38°8 590 | 21-6 503 
548 || 145 365 
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