Trend Arrow Indicators; Barometric / Atmospheric Pressure - National Geographic WIFI Weather Center 7in1 Bedienungsanleitung

5 Rain/ stormy
Note:
• The accuracy of a pressure-based weather forecast is about 70% to 75%.
• The weather forecast is meant for the next 12 hours, it may not necessarily reflect the current situ-
ation.
• The snow weather forecast is not based on air pressure, but on the outdoor temperature. When
the outdoor temperature is below -3°C (26°F), the snow symbol is shown on the LCD display.

34 Trend arrow indicators

1
1 Rising
3 Falling
The temperature and humidity trend indicator shows the trends of changes in the forthcoming few
minutes. Arrows indicate a rising, steady or falling trend.

35 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.
To display the barometric pressure in a different unit of measurement
In normal display mode, press the BARO button for about 2 seconds to change the unit in this order:
(hPa, inHg or mmHg).
Change the mode from (ABS) Absolute Air Pressure to (REL) Relative Air Pressure
In normal display mode, press the BARO button to toggle between absolute air pressure and relative
air pressure.
• NOTICE!
• 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.
6 Snowy
2
2 Steady
3
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