‘table IV visibility 
0 Dense fog .........--.- 50 yards 
(i) Uns ee aoa oe deeeoeas 200 yards 
GR eds Se eA ae ee een 400 yards 
3 Moderate fog ........ 1000 yards 
4 Thin fog or mist ........ 1 mile 
NVASIDINTY SOON, 04). c(eray< ose 2 miles 
6 Visibility moderate ...... 5 miles 
7 Visibility good ......... 10 miles 
8 Visibility very good 30 miles 
9 Visibility excellent .. over 30 miles 
(Use range-finder readings of known land- 
marks, if possible.) 
table V sea height 
Code 
Flat calm 
Less than 1 foot 
1 to 3 feet 
3 to 5 feet 
5 to 8 feet 
8 to 12 feet 
12 to 20 feet - 
20 to 40 feet 
40 feet and over 
Very rough, 
confused sea 
OONAMDRWN—$O 
table II cloud type 
Code ate 
WOONONA WHO 
Stratus or fractostratus 
Cirrus : 
Cirrostratus 
Cirrocumulus 
Altocumulus 
Altostratus 
Stratocumulus 
Nimbostratus 
Cumulus or fractocumulus 
Cumulonimbus 
Code 
No clouds 
less than 1/10, or 1/10 
2/10 and 3/10 
4/10 
5/10 
6/10 
7/10 and 8/10 
9/10 and 9/10 plus 
10/10 
Sky obscured 
table Ill cloud cover 
WONAUMAWN—O 
