Observations of the United States Signal Service. 9 
beneath it. This fact is distinctly indicated by the following 
observations for October 20th, 7.35 4. M., from stations west of 
the limits of the rain area. 
we: Direction of Amount of 
Direction. Ve loci ty upper clonds. clouds. 
Alpena __._.. North. 9 miles. S.W. & 
Detroit... ... North. 12 * South. 4 
Louisville ___ North. 16 South. > 
Toledo. North. bd aa S.E. £ 
In No. 48, south winds generally prevailed in Georgia and 
the Carolinas, with cold winds from the west and northwest 
in the Northwestern States. This westerly current probably 
current can sometimes be seen. 
The average velocity of the wind at the date of the.observa- 
tain-falls are seldom accompanied by very high wind. 
the most noticeable facts connected with extensiv 
i rs 
Of precipitation. If in each of the cases mentioned in the 
table on page 2 we trace the boundary of that area over 
Which the rain-fall was at least one inch, we shall find that in 
half of these cases there were two such areas distinct from each 
other, and in eleven eases there were three such areas. If we 
‘ace the area of a rain-fall of at least one-half inch, we shall 
find that in forty-five cases there were at least two distinct 
