64 
TETSUYA FUJITA 
40 50 60 70 80 90 100 
= (eee 
| AR 90 110 130 160 180 200 220 MPH 
SS 
SS (e) 
) / y 
oe 
s (Ke > A 
[o} 
ie) 
200 
HEIGHT ABOVE THE GROUND 
a 
fo} 
ie) ~— 
a 
100 
ee | —— 
1827 1828 1829 1830C JUN 20'57 
Fie. 4—Cyclostrophic wind speed computed from the gradient of the edge 
of the funnel; the maximum speed, 230 mi/hr, appeared shortly before 
18h29m CST at the 100-meter level; no computation was made for the por- 
tion of the rounded bottom where the wind was far from being cyclostrophic 
18 289 
18.296 CST 
a 
fe) 
aD 
fe) 
TANGENTIAL WIND SPEED 
8 & 
fe} 
100 150 200m 
RADIUS ———> 
Fie. 5—Radial distribution of tangential wind speed in meters per second; 
arrows in upper figures give the location of the maximum wind speed com- 
puted along the dotted lines 
sion, reaching their condensation pressures at C, 
and C,, respectively. Assuming that the expan- 
sion along the surface is given by a straight line 
A,-A,—A/ on the adiabatic diagram, and that the 
expansion along A,-C; and A,-C, is dry adiabatic 
and reversible, the temperature and pressure 
change of parcels flowing into the bottom of the 
rounded bottom funnel were qualitatively de- 
scribed. 
Conclusions—It was found that the cyclo- 
strophic wind speed computed from the shape of 
the funnel with the combined use of hydrostatic 
