24
Figure 18
6.4.3 Relative Pressure Calibration Discussion
The calibration was set on WS View app. 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
of 1000 feet (305 m), but the relative pressure is 30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 inHg (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.
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.
6.5 Rain Display
6.5.1 Rain Increments of Measure
Press and hold [RAIN/PRE] for two seconds switch between Rain and
Pressure. While in Rain mode press the [RAIN/PRE] to switch
