205 - Atmospheric pressure

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24 Terms

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Define atmospheric pressure

Force per unit area exerted by the atmosphere as a consequence of its weight

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Define station elevation

Vertical distance in meters above MSL of the datum level to which barometer readings are corrected to give station pressure

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Define mean sea level pressure

Station pressure reduced to MSL

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Characteristics of ICAO standard atmosphere

  • Air is a perfectly dry gas

  • Pressure at sea level is 29.92 Hg or 1013.2 hPa

  • Temperature at sea level is 15°C

  • Temperature decreases at 1.98°C/1000 ft

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Define altimeter setting

Computed value of MSL which is used to set the sub-scale of an altimeter so it indicates height of the instrument above MSL

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How shall the altimeter setting be reported

To the nearest hundredth of an inch

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How shall sea level pressure be reported

Nearest tenth of a hectopascal

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How shall pressure be determined

Using Nav Canada approved equipment

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Define pressure tendency

Characteristic and amount of change in station pressure during the three hours preceding the observation

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What times shall pressure tendency be reported

0000, 0300, 0600, 0900, 1200, 1500, 1800, 2100

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what unit is tendency amount determined in

Tenths of a hectopascal

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When the pressure trace resembles more than one code how is tendency characteristic coded

Using the last portion of the trace

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What is the most important thing when coding pressure tendency

Use a code that represents an increase if there is an increase and vice versa

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When pressure sensor information is not available on HWOS what shall you do

Obtain pressure from the digital barometer

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When is the remark PRESFR used

Station pressure is falling 2.0+ hPa per hour at time of observation

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When is the remark PRESRR used

Station pressure is rising 2.0+ hPa per hour at time of observation

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What is required when pass weather to a buddy site

Backup Weather Input Form

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Who is the buddy site for most units

The local FIC

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