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Navigation
NAU 102
Lesson 32
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Weather Instruments
The safety of crew, passengers, cargoand the ship itself is dependent on
making good weather decisions.
Weather has a significant impact on
every voyage.
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Weather Instruments
We are our own weather station at sea.
We must develop an accurate
forecast using data received from
shore and that we collect ourselves.
Youll learn how to make a forecast
in Meteorology.
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Duties of the Mate
At all times, be knowledgeable of the
current weather.
Wind direction and speed
Wave direction and heightVisibility
Trend of the barometer
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Duties of the Mate
At all times, be knowledgeable of the
weather forecast.
Obtain 24 hour forecast from
weather fax, messages, etc.
Interpret the forecast for your area.
When necessary, make your own
forecast.
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Weather Instruments
Satellites
Meteorological data is collected by:
Buoys
Ships (thats you)
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Duties of the Mate
Conduct marine surface weather
observations.
Make observations
Log observations
Transmit observations to National
Weather Service
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Duties of the Mate
Conduct marine surface weather
observations.
4 times each day
0000, 0600, 1200, 1800 GMT
Voluntary program
7000+ ships worldwide (600 US)
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Weather Observations
Data is collected and
formatted inaccordance with the
Marine Observers
Handbook.
http://www.nws.noaa.gov/om
/marine/handbk1.pdf
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Weather Instruments
Aneroid Barometer
Measures atmospheric pressure.
Air pressure exerts a crushing force
on a thin metal element.
Linkages move to a pointer to
indicate the pressure on a scale.
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Aneroid Barometer
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Aneroid Barometer
Must be properly adjusted.
(Usually done by a professional, often for free.)
Reading must be adjusted for elevation
to give pressure at sea level.
(Note: Mercurial Barometers must also be
corrected for latitude and temperature.)
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Barometers
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Weather Instruments
Barograph
A recording
barometer.
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Weather Instruments
Thermometer
Measures air
temperature.
You must be able to
convert betweenCelsius and
Fahrenheit scales.
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Temperature Conversions
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Temperature Conversions
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Weather Instruments
Hygrometer
Measures Relative Humidity and
Dew Point.
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Weather Instruments
Relative Humidity ratio of amount
of water vapor in the air to the
amount it could hold at the currenttemperature.
Dew Point the temperature atwhich water vapor will condense.
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Weather Instruments
Hygrometer
Most common type: sling
psychrometer.
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Sling Psychrometer
Two Thermometers: 1 wet, 1 dry
Temperature difference is noted.
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Sling Psychrometer
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Psychrometer
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Introduction to Navigation
Questions?