Color Screen Multi-channel Weather Station User Manual
4.3 Check Barometric Pressure
4.3.1 Barometric Pressure History
While in normal mode, press BARO./- to check the barometric pressure.
Press the BARO./- button to switch to past 12hr/24hr/48hr/72hr average
pressure. To exit the barometric pressure history mode, press the
SNOOZE/LIGHT key (on the top of the display console), or wait 30 seconds
for the timeout to take effect.
4.3.2 Relative Pressure Calaibration
You will want to calculate your barometric pressure to an official reporting
station in your area. Since barometric pressure does not drastically
change in a 50 mile radius (unless the weather is rapidly changing), this
method of calibration is acceptable.
To determine the relative pressure for your location, locate an official
reporting station near you (the internet is the best source for real time
barometer conditions, such as Weather.com or Wunderground.com), and
set your weather station to match the official reporting station.
4.3.3 Relative vs. Absolute Pressure
While in normal mode, Press and hold the BARO./- button for 2 seconds
you can switch between absolute (ABS) pressure and relative (REL)
The display 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 pressure
(the pressure your location would be at if located at sea-level) is generally
higher than your measured pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude
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