10 E. Loomis— United States Weather Maps. 
are proportioned to the velocity of the different winds. It is 
at once perceived that there is a strong tendency of the winds 
inward toward the central area of the storm. The following 
table aes the inclination of the several winds to a tangent to 
the circle; that is, it shows how much the average direction fF 
the wind in each quadrant differs from what it would be if t 
wind revolved in a circle around the storm’s center. 
WW . §.quadrant. E.quadrant. N. quadrant. 
Inclination, pg 48’ 49° 35” 32° 6” AT° 27’ 
Ny The average departure of 
the winds from a a tangent 
line is thus seen to be 
more se forty-five degrees. 
h mbers show how 
rroneous was Mr. Red- 
field's theory of storms 
when applied to the ordin- 
ary storms of the United 
States, and it appears that 
& 
tion and entirely over- 
tion is an effect 1 ae from this inward motion. It requires 
no argument to prove that when the er is flowing from all 
uarters inward toward a central area, as shown in the last 
iagram, there is a rapid noctiinniation of air, which can only 
escape by an upward motion; that is, there must result a strong 
upward movement of the air near the center of the storm. As 
this air ascends, it comes into a region which is colder in conse- 
quence of its elevation, by which means its vapor is condensed, 
and thus by a direct comparison of observations we deduce a 
result which explains the cause of the rain 
But the average progress of storms is only 25°6 miles; that is, 
at the height of 6, 000 feet in the western quadrant of a storm, 
the velocity of the wind (estimated in the same direction as that 
of the storm’s progress) is 68 per cent greater than the velocity 
with which the storm advances. This excess of motion of the 
wind affords a measure of the force of the ei iahee movement in 
2 the center of a sto’ 
