Weather Tendency Indicator - La Crosse Technology WS-9025U Instruction Manual

The icons displayed forecasts the weather in terms of getting better or worse
and not necessarily sunny or rainy as each icon indicates. For example, if the
current weather is cloudy and the rainy icon is displayed, it does not mean that
the product is faulty because it is not raining. It simply means that the air
pressure has dropped and the weather is expected to get worse but not
necessarily rainy.
Note:
After setting up, readings for weather forecasts should be disregarded for the
next 12-24 hours. This will allow sufficient time for the Weather Projection
Station to collect air pressure data at a constant altitude and therefore result in
a more accurate forecast.
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 Projection Station has been
designed for use. In areas that experience sudden changes in weather (for
example from sunny to rain), the Weather Projection Station will be more
accurate compared to use in areas where the weather is stagnant most of the
time (for example mostly sunny).
If the Weather Projection Station 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 12-24
hours. By doing this, the Weather Projection Station will not 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
(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,
it will remain permanently visualized on the LCD.