Barometric / Atmospheric Pressure; Wind Speed And Direction - National Geographic Colour Weather Center 5in1 Manual De Instrucciones

29 Barometric / Atmospheric Pressure

Atmospheric pressure (hereinafter referred to as "air pressure") is the pressure at any place on earth
caused by the weight of the layer of air above it. Air pressure is proportional to average pressure and
decreases gradually with altitude. Meteorologists use barometers to measure air pressure. Because
the weather is highly dependent on changes in air pressure, it is possible to make a weather forecast
from the measured changes in air pressure.
In normal display mode, press the BARO button repeatedly to display the desired unit (hPa, inHg or
mmHg).
Set relative atmospheric pressure
1. Find out the relative air pressure value for your location (or as close to it as possible) through the
local weather service, the Internet or other sources.
2. Press the BARO button for approx. 3 seconds until ABS or REL flashes.
3. Press the UP or DOWN key until REL flashes.
4. Press the BARO button to move to the next setting value.
5. Press the UP or DOWN key to change the REL value (according to the researched value).
6. Finally, press the CLOCK-SET button to save the settings and exit the setting mode.
• NOTICE! ABS: Absolute air pressure at your current location
• NOTICE! REL: Relative air pressure based on sea level (N.N.)
• NOTICE! The default relative air pressure value is 1013 mbar/hPa (29.91 inHg), which is rel-
ative to the average air pressure value.
• NOTICE! If the value for the relative air pressure is changed, the weather displays also
change as a result.
• NOTICE! The built-in barometer registers changes in absolute air pressure caused by the en-
vironment. Based on the collected data, a forecast for the weather conditions in the next 12
hours can be made. The weather indicators change according to the determined absolute air
pressure after only one hour of operation.
• NOTICE! The relative air pressure is based on sea level, but it also changes with changes in
absolute air pressure after one hour of operation.

30 Wind speed and direction

Reading the wind direction
Wind direction indic-
ator
Meaning
Real-time wind direction
Wind directions appeared in the last 5 minutes (max. 6)
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