OPNAV FORM 31 4< 4& v 
Previous editions obsolete 
S/N-0 10 7-714-4101 
DEPARTMENT OF THE NAVY 
SHIP WEATHER OBSERVATION SHEET 
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SECTION I 
TIME 
(.GMT) 
WINDS 
□ v" ' F estimated 
VISI¬ 
BILITY 
(Miles) 
WEATHER 
(Symbols) 
BAROMETER 
(Inches) 
TEMPERATURE 
(Degrees and tenths) 
CLOUDS 
SEA 
WATER 
TEMP. 
(Degrees 
and 
tenths) 
SEA WAVES 
SWELL WAVES 
DRY 
BULB 
WET 
BULB 
AMOUNT 
(Tenths) 
HEIGHT 
TYPE 
PERIOD 
(Seconds) 
HEIGHT 
(Feet) 
DIRECTION 
(Ttue) 
PERIOD 
(Seconds) 
HEIGHT 
(Feet) 
DIRECTION 
(True) 
FORCE 
(Knots) 
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SECTION II 
SYNOPTIC OBSERVATIONS 
FIRST GROUP 
OF 
MESSAGE 
INDICATOR 
POSITION OF SHIP 
DAY OF MONTH 
TIME 
(GMT) 
WIND INDICATOR 
Total 
Cloud 
Amt. 
(Coded) 
WIND 
VISI¬ 
BIL¬ 
ITY 
(90-99) 
WEATHER 
PRESSURE 
AIR 
TEMP. 
(°C) 
CLOUDS 
COURSE OF SHIP (0-9)' 
SPEED OF SHIP (0-9) 
3-H 
PRE 
TEN 
OUR 
SSURE 
DENCY 
INDICATOR 
AIR- 
SEA 
DIFF. 
(Coded) 
DEW 
POINT 
(°C) 
LATITUDE 
(Degrees 
and 
tenths) 
QUARTER 
OF GLOBE 
LONGITUDE 
(Degrees 
and 
tenths) 
DIREC¬ 
TION 
(True) 
(00-36) 
SPEED 
(True) 
(Knots) 
PRES¬ 
ENT 
(00-99) 
PAST 
(0-9) 
BAROMETER 
CORRECTED 
(Mb) 
AMOUNT OF 
LOW CLOUD 
o 
Li- ^ 
o <? 
LlJ 0. 
CL 
> 
H 
HEIGHT OF 
LOW CLOUD 
O 
Ll _ 
O cr> 
LlI S- 
CL 
> 
H 
TYPE OF C H 
(0-9) 
CHARACTER¬ 
ISTIC (0-8) 
AMOUNT OF 
CHANGE 
(Mb and tenths) 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
\ 
16 ! 
17 
18 
.19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
99 
La La Lg 
Qc 
*-o b b *"0 
YY 
GG 
'w 
N 
dd 
ft 
VV 
ww 
W 
PPP 
TT 
Nh 
c L 
h 
^M 
c H 
D s 
v s 
a 
PP 
0 
T s T s 
T d T d 
SHIP 
99 
00 
0 
SHIP 
99 
06 
* 
0 
SHIP 
99 
12 
0 
SHIP 
99 
18 
0 
DO NOT TRANSMIT 
DRY BULB 
(Degrees 
and tenths) 
WET BULB 
(Degrees 
and tenths) 
SEA WATER 
TEMPERATURE 
(Degrees 
and tenths) 
Ai 
a 2 
a 3 
Celsius 
Celsius 
Celsius 
INDICATOR 
SEA WATER 
TEMPERATURE 
(Degrees 
and tenths) 
TENTHS VALUE 
AIR TEMP. °C 
ICE ACCRETION 
SEA WAVES 
SWELL WAVES 
SEA ICE 
INDICATOR 
SOURCE 
THICKNESS 
RATE 
INDI¬ 
CA¬ 
TOR 
PERIOD 
HEIGHT 
(Coded) 
DIRECTION 
(True) 
PERIOD 
(Coded) 
HEIGHT 
(Coded) 
INDICATOR 
KIND 
EFFECT 
BEAR¬ 
ING 
DIS¬ 
TANCE 
ORIEN¬ 
TA¬ 
TION 
29 
30 
31 
32 
33 
34 
35 
36 
37 
38 
39 
40 
41 
42 
43 
44 
45 
46 
47 
1 
T w "'"w T w 
2 
's 
E S E S 
R s 
3 
P P 
r w r w 
H w R w 
d w d w 
Pw 
H w H w 
ICE 
C 2 
K 
Di 
r 
e 
1 
2 
3 
ICE 
1 
2 
3 
ICE 
1 
2 
3 
ICE 
1 
2 
3 
ICE 
REMARKS 
> 
EXAMINED 
USN, NAVIGATOR 
C-3 927 
S « 
