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5.9
Barometric Pressure Display and Settings
Note: The barometric pressure sensor is inside the console. Barometric pressure is the same inside or
outside of your home or facility.
5.9.1
Barometric Pressure Units of Measure
In normal time mode, press the
BARO
button (on the front of the console) to change barometric units
of measure (hPa / inHg / mmHg).
5.9.2
Absolute Pressure vs. Relative Pressure
Press and hold the
BARO
button for 2 seconds to switch between relative pressure and absolute
pressure.
5.9.3
Relative Pressure Calibration
Please Reference Section 6.6.1 for details on relative pressure calibration, the purpose of calibrating
relative pressure, and how to determine relative pressure in your area.
5.9.3.1
Relative vs. Absolute Pressure and Calibration
The console displays two different pressures: absolute (measured) and relative (corrected to sea-level).
To compare pressure conditions from one location to another, meteorologists’ correct pressure to
sea-level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected
relative pressure (the pressure your location would be at if located at sea-level) is generally higher
than your measured absolute pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but
the relative pressure is 30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013 mb). This is the average sea-level pressure
around the world. Relative pressure measurements greater than 29.92 inHg (1013 mb) are
considered high pressure and relative pressure measurements less than 29.92 inHg are considered low
pressure.
5.10
The Forecast
Figure 21
The weather forecast or pressure tendency is based on the rate of change of barometric pressure. In
