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Weather Observation and Reporting, Continued
CNOC 3140/8
Part II
Additional
Reporting
Requirements
Additional
Information
Column
Number
(A)
(B)
(C)
(D)
(E)
(F)
Column
Name
Position
Course
Speed
Seawater
Temperature
Sea Waves,
Period, and
Height
Swell
Waves,
Direction,
Period, and
Height
Explanation
Abbreviated ship’s position.
General direction of the ship’s course.
Ship’s speed.
Seawater temperature reported to the nearest 0.1
Fahrenheit.
The duration in seconds from the crest of one
wave to the next and the average wave height.
Sea waves are caused by local wind conditions.
The direction, duration in seconds from the crest
of one wave to the next, and the average wave
height.
Part II is designed to allow transmission via radio message of encoded
weather information. The step-by-step instructions are printed in the
Manual for Surface Ship’s Weather Observations and will not be
reproduced here. This manual should be consulted each time an OBS
is made.
Ship’s are required to submit encoded weather every 6 hours of GMT.
For example a message should be sent at 0000, 0600, 1200, and so on.
If winds are greater than 33 knots, then messages must be sent with an
immediate precedence every 3 hours.
As you may have guessed, weather, like navigation, is a complex subject
on which volumes have been written. The objectives of this chapter are
to prepare you to report the weather; however, senior QMs should
thoroughly acquaint themselves with all aspects of weather. The AG
series of TRAMANs is an excellent place to begin. Also Pub No. 9,
Bowditch, has comprehensive information about weather and the
mariner.
10-35
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