1918. WOLKENWAARNEMINGEN. De Bilt. 
Datum. 
UUR. 
Drift uit: 
WOLKENVORMEN. 
Sept. 
15 
9 a 
ONO 
Nimbus. 
3 p 
WZW 
Nimbus. 
bp 
ZW 
Cumulus. 
» 
16 
9a 
W 40° Z 
Cumulus. 
yy 
17 
9 a 
W 40° Z 
Alto-Cum. 
9 a 
W 70° Z 
Cumulus. 
18 
10.45a 
Z 40° W 
Alto-Cum. 
10.45a 
Z 30° W 
Strato-cum. 
2.1 Op 
W 40° Z 
Cumulus. 
» 
19 
10a 
W 40° Z 
Fracto-Cum, Cum. 
20 
9.10a 
W 
Alto-Cum. 
9.10a 
W 20° Z 
Cumulus. 
» 
21 
0.1 5p 
W 10° N 
Cum-Nimb, Fracto — Nb. 
15p 
W 
Strato-Cum. 
Ap 
W 20° Z 
Strato-Cum. 
» 
22 
8.30a 
Z 
Fracto-Stratus. 
1.20 p 
ZW 
Fracto-Cum. 
4.20 p 
zzw 
Fracto-Stratus. 
» 
23 
11.15a 
Z 35 u W 
Strato-Cum. 
3.10 p 
Z 30» W 
Alto-Cum. 
3.1 Op 
Z 40° W 
Cum-Nimb. 
» 
24 
2.1 Op 
W 10° Z 
Cumulus. 
25 
4.30 p 
W 
Cumulus. 
» 
26 
9 a 
W 
Alto-Cum. 
9 a 
W 10° z 
Cum, Fracto-Cum. 
» 
27 
9 a 
W 45° Z 
Alto-Cum. 
9a 
W 45° Z 
Cum-Nimb 
9 a 
W 10° N 
Cumulus. 
» 
28 
0.30p 
W 30° Z 
Cum-Nirnb. 
0.30p 
W 50° Z 
Alto-Cum. 
„ 
29 
8.30a 
W 
Alto-Cum. 
9.20a 
W t z 
Fracto-Cum. 
1.50p 
ZW t z 
Stratus. 
1.50p 
WZW 
Cumulus. 
1.50p 
ZW t w 
Fracto-Cum. 
5.1 Op 
Z t w 
Nimbus. 
30 
10.35a 
W 10° N 
Fracto-Cum. 
10.35a 
w 
Strato-Cum. 
4. 1 5p 
w 
Alto-Cum. 
4. 15p 
N 20° W 
Fracto-Cum. 
Oct. 
1 
10.35a 
W 30° N 
Alto-Cum. 
10.35a 
W 10° N 
Cum-Nimb, Fracto-Cum 
yy 
2 
8 a 
WNW 
Nimbus. 
WZW 
Nimbus. 
6p 
W 
Nimbus. 
yy 
3 
10a 
W 40 u Z 
Fracto-Stratus. 
10a 
W 30° Z 
Strato-Cum. 
yy 
4 
9a 
W 40" Z 
Strato-Cum. 
10a 
W 30 Z 
Fracto-Cum. 
2.15p 
W 10° z 
Cumulus. 
