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low pressure
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Actual Pressure Display
The weather station displays the current pressure in hPa: A pressure of over 1015
hPa is regarded as high pressure (good weather) and under 1015 hPa is regarded
as low pressure.
Pressure is given at sea level so that it can be compared with that at different
altitudes, it is therefore possible that the official pressure does not agree with the
pressure your weather station indicates.
A change of +/- 5hPa will change the displayed trend.
Why is a pressure measurement necessary?
Generally, low pressure is associated with bad weather
and high pressure with good weather.
An area of low pressure is always surrounded by an
area of higher pressure, the air with higher pressure
cannot enter the low pressure, it is forced upwards
and the moisture condenses and forms clouds. The
reverse happens if a high pressure is surrounded by
a low pressure, the air is forced downwards, the air is
warmed up and the moisture evaporates.
Altitude Setting
The weather station can be configured to work at different altitudes (AMSL)
because the pressure changes with altitude. The weather station is preset to
be used at sea level (0 metres AMSL) See the section: ”2. Setting the pressure
altitude compensation:”
Display of the temperature / pressure for the past 12 hours.
The weather station has symbols to show the pressure and temperature for the
past 12 hours. Press
[Select °C / °F/-]
(in Clock 1 mode) to switch from:
Pressure
→
Indoor temperature
→
Outdoor temperature
switch between the different channels (1 – 4) using
[Alarm / Channel]
.
