STRUCTURE OF CONVECTIVE STORMS 63 
METER 
{a} 
a = \ 
=) 
[o) 
ra 230 
Oo 90, 
z Cox 
iz I7 NS 
300 70 170 Rg 200 
3 N % | Pe 
2 O. 370 ee 
a 
= 
x \ 
oO 
7 200 io 
a5 
2 
—_o—— 
= = 
100 25024055 210— 200 
e 
NDED=BOTTOM=FUNNEL 100 
wae 30.4050. 
mae SSS sea a 
1827C 1828C 1829C 1830C JUN. 20'57 
Fria. 2—Detailed description of the cone-shaped funnel in its early stage; the bottom of the funnel 
was rounded, and lifted upon reaching the ground; isopleths are funnel diameters in meters 
CENTRIFUGAL FORCE AT THE FUNNEL EDGE 
INpze a AVE __ CENTRIFUGAL FORCE 
Ra eR Dass GRAVITY 
METER 
400 
a 
ie 
=) 
fo} 
(4 
oO 
Ww 
= 300 
WwW 
> 
fo} 
a 
¢ 
kb 
& 200 
wW 
ze 
100 
UNDED ote 
Ye 
1827C 1828 1829 1830C JUN 20'57 
Fic. 3—Vertical and time change in centrifugal force acting upon the par- 
cel circling around the funnel; wind is assumed to be cyclostrophie 
Now, the illustration shows that the parcels cated at the surface of the same condensation 
expanding along stream lines A,-A,-C, and A.- _ pressure. On the other hand, the parcels following 
A.-C, are friction free; therefore, the moisture in- the paths A,-A,-C, and A,-A,-C, would increase 
side the pareel would condense at C, and C, lo- their entropy through their irreversible expan- 
