Weather Tendency Indicator; Air Pressure History Graph - La Crosse Technology WS-2811U Operation Manual

Wireless professional weather center
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Common to weather forecasting, absolute accuracy cannot be guaranteed.
The weather forecasting feature is estimated to have an accuracy level of
about 75% due to the varying areas the Weather Center has been designed for
use. 75% accuracy is comparable to the best meterological forecasting rate. In
areas that experience sudden changes in weather (for example from sunny to
rain), the Weather Center will be more accurate compared to use in areas
where the weather is stable most of the time (for example mostly sunny).
If the Weather Center is moved to another location significantly higher or lower
than its initial standing point (for example from the ground floor to the upper
floors of a house), discard the weather forecast for the next 48-60 hours, as the
Weather Center may mistake the new location as being a possible change in
air-pressure when really it is due to the slight change of altitude.

WEATHER TENDENCY INDICATOR

Working together with the weather icons is the weather tendency indicators
(arrow located on the left and right sides of the weather icons). When the
indicator points upwards, it means that the air-pressure is increasing and the
weather is expected to improve, but when indicator points downwards, the air-
pressure is dropping and the weather is expected to become worse.
Taking this into account, one can see how the weather has changed and is
expected to change. For example, if the indicator is pointing downwards
together with cloud and sun icons, then the last noticeable change in the
weather was when it was sunny (the sun icon only). Therefore, the next change
in the weather will be cloud with rain icons since the indicator is pointing
downwards.
Note: Once the weather tendency indicator has registered a change in air
pressure, either the upward or downward tendency arrow will be displayed until
the tendency changes again.

AIR PRESSURE HISTORY GRAPH

The LCD shows the relative air pressure value and the air pressure history on a
bar graph.
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