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Define atmospheric pressure
Force per unit area exerted by the atmosphere as a consequence of its weight
Define station elevation
Vertical distance in meters above MSL of the datum level to which barometer readings are corrected to give station pressure
Define mean sea level pressure
Station pressure reduced to MSL
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
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
How shall the altimeter setting be reported
To the nearest hundredth of an inch
How shall sea level pressure be reported
Nearest tenth of a hectopascal
How shall pressure be determined
Using Nav Canada approved equipment
Define pressure tendency
Characteristic and amount of change in station pressure during the three hours preceding the observation
What times shall pressure tendency be reported
0000, 0300, 0600, 0900, 1200, 1500, 1800, 2100
what unit is tendency amount determined in
Tenths of a hectopascal
When the pressure trace resembles more than one code how is tendency characteristic coded
Using the last portion of the trace
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
When pressure sensor information is not available on HWOS what shall you do
Obtain pressure from the digital barometer
When is the remark PRESFR used
Station pressure is falling 2.0+ hPa per hour at time of observation
When is the remark PRESRR used
Station pressure is rising 2.0+ hPa per hour at time of observation
What is required when pass weather to a buddy site
Backup Weather Input Form
Who is the buddy site for most units
The local FIC