68 
AIR MASS ANALYSIS 
See ee Eee — 
land, the winter thunderstorms of 
that section being almost entirely of 
this type; rapidly intensifying cy- 
clones (often secondaries) bring a 
tongue of Tm air to their centers 
where it is rapidly occluded, causing 
- 46 
yy se 
Yio Stew cut 
17 
2hp ©. Cist, na SWhor 
C/o Cu 
15° 
ah49—5h47 
Lwow 14.11.34 
34 32 
To Cu cong 
140 Gv 
%o Cu cong. 
SE2 
Yio Acu 
6°32~ 659 
Lwow 9v34 
Ho Ci noth. 
2/0 Cunb, 
20 Ci Cist, Ciew 
thundershowers along the coast. In 
the warm months of the year the 
effect of the colder water tends to 
retard the warm front, while the cold 
front proceeds to occlude the warm 
sector. 
2g Gi Cit. —— Cist nebut 
25° 20. 
49°34 = 15°05 
19'%45 = 19°42 
S/n Ct unc 
1/10 Cund 
4/4 Stcu vesp 
4/ag Cunb. 
2fg Ci unc. 
Yq Acu a 
3 
NE 4 
GEG 
Frou vesp 
10'5e + 19°24 43°57 - 14°30 48°29 ~ 18°58 
Fic. 17. AIRPLANE SOUNDINGS AT DIFFERENT Hours OF THE DAY, 
showing development of Cu clouds from insolation in a dry and a 
moist air mass. 
July 11, 1934 (dry) and August 9, 1934 (moist) , 
remarkable series of illustrations of convection published by 
These were made at Lemberg (Lwow) Poland on 
and are from the 
Kochanski 
(Comm. Geophys. Inst. Univ. Lwow, Vols, UNion 109.) 1936) pyaar 
soundings are plotted on Refsdal’s emagram coordinates (similar to 
Stiive’s diagram, i.e., log pressure vs T) and the areas of positive 
energy are shaded in the same manner as on a tephigram. The dotted 
lines are the temperature curves for the descent of the plane, which 
