294 MOORE AND VONNEGUT 
0730 0800 0830 0300 0930 1000 (030 
| 
POTENTIAL GRADIENT MEASURED 
OVER CLOUD FROM P-58 
‘ 
n 
POTENTIAL GRADIENT 
(V CM) 
+ 
i 
So o 
a 
g 3 
i te 
=f CONVECTIVE CELL es 
8 ISOTHERMAL STABLE PS SV ae 
Si ——— LVER 200M. DEEP mn A Ea 
wW G re] = 
5 32 
Xs ey t 
5 ALTITUDE ra 
=z 4 = 40° 
TERRAIN : a 
ALTITUDE .Z8 
AT UPPER RADIOSONDE Bz 
POTENTIAL GRADIENT 5 
IN CLOUD 5 
AT LOWER RADIOSONDE 
- 
Vv 
Oz 
o 
a 
ol z 
a je Nae LLL ™. > B 
g : : 55 
gS POTENTIAL GRADIENT B 
3 4 500) AT SUMMIT 
es 10 
8 3 re) 
at 
o eB + = 
z wn 
3 2500 SPACE CHARGE 2 
‘ie AT SUMMIT 2 
Fé 
22 
as 
0730 0800 (000 
MOUNTAIN STANDARD TIME s Se ses 
3 3 TEP 3 
2 Z329 2 
on § ZESS"22 & 
S32 S zedguds & 
ee HES gzz 2 
beg THEE 5 
Fa & 23983*9 = 
7 
Fig. 3—Development of convection and electrification August 1: 
wo 
ets) 
i 
