OPNAV FORM 3U4-1 (9-64) 
0 107 - 714-4100 
DEPARTMENT OF THE NAVY 
uss 
SHIP WEATHER OBSERVATION SHEET 
_DATE (GMT) _ 
19 
AT/PASSAGE FROM _ TO . 
TABLE I 
TIME 
(GMT) 
WINDS 
V ' IF ESTIMATED 
VISI- 
BIL- 
ITY 
(Miles) 
WEATHER 
(Symbols) 
BAROMETER 
(Inches) 
_ 
TEMPERATURE 
(Degrees and tenths) 
CLOUDS 
SEA 
WATER 
TEMP. 
(Degrees 
and 
tenths) 
SEA WAVES 
SWELL WAVES 
Direct ion 
(T rue) 
Force 
(K nots) 
Dry 
Bulb 
Wet 
Bulb 
Amount 
(Tenths) 
Hei ght 
Type 
Direction 
(True) 
Per iod 
(Seconds) 
Height 
(Feet) 
Direction 
(True) 
Per iod 
(Second s) 
— 
Height 
(Feet) 
00 
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TABLE II 
SYNOPTIC OBSERVATIONS 
FIRST GROUP 
OF 
MESSAGE 
Day 
of 
Week 
d-7) 
(GMT) 
POSITION OF SHIP 
TIME 
(GMT) 
T otal 
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-HOUR 
PRESSURE 
TENDENCY 
SIGNIFICANT CLOUD 
Oc¬ 
tant 
(0-3) 
(5-8) 
Latitude 
(Degree s 
and 
tenths) 
Longitude 
(Degrees 
and 
te nth s) 
Direction 
(Tr ue) 
(00-36) 
Speed 
(True) 
(Knots) 
P resent 
(00-99) 
Past 
(0-9) 
Barometer 
Corrected 
(Mb) 
r 
Amount of 
Low Cloud 
_i 
u 
"o 
oL 
Height of 
Low Cloud 
Type of C M 
(0-9) 
Type of C H 
(0-9) 
Characteristic 
(0-8) 
— ---—-- 
Amount of 
Change 
(Mb and tenths) 
1ndicator 
Amount 
(E ights) 
Type 
He i ght 
_j 
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 
- 1 
Y 
Q 
L L L 
j " a 
L L L 
o o o 
GG 
N 
dd 
ff 
VV 
ww 
W 
PPP 
TT 
N h 
c L 
h 
Cm 
C H 
D 
S 
V 
S 
a 
PP 
8 
N 
S 
c 
h h 1 
S S 
-1 
SHIP 
00 
8 
— 
SHIP 
06 
8 
SHIP 
12 
8 
SHIP 
18 
8 
DO NOT TRANSMIT 
Dry Bulb 
(Degrees 
and tenths) 
Wet Bulb 
(Degrees 
and tenths) 
Sea Water 
Temp. 
\Degrees 
and tenths) 
A 1 
A 2 
A 3 
Cel s i us 
Celsius 
Celsius 
_ 
_ 
Indicator 
AIR- 
SEA 
DIFF. 
(Coded) 
DEW 
POINT 
(°C) 
SEA WAVES 
SWELL WAVES 
ICE ACCRETION 
SEA ICE 
6 
O 
u 
~TD 
C 
Direction 
(Coded) 
Period 
(Coded) 
Height 
(Coded) 
Indicator 
Direction 
(Coded) 
Period 
(Coded) 
Height 
(Coded) 
Indicator 
Source 
Thickness 
Rate 
1 nd icator 
Kind 
Effect 
Bearing 
Distance 
Orientation 
28 
29 
30 
31 
32 
33 
34 
35 
36 
37 
38 
39 
40 
41 
42 
43 
44 
45 
46 
47 
48 
0 
T s T s 
Td T d 
1 
d d 
W W 
P 
W 
H 
W 
1 
d d 
w w 
P 
W 
H 
W 
2 
1 
S 
E , 
R 
S 
ICE 
<=2 
K 
D f 
r 
e 
0 
1 
1 
2 
ICE 
0 
1 
1 
2 
ICE 
0 
1 
1 
2 
ICE 
0 
1 
1 
2 
ICE 
REMARKS 
USN, NAVIGATOR 
EXAMINED 
