La Crosse Technology WS-9724 - Manual (Page 27)

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If the Weather 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), remove the
batteries and re-insert them after about 30 seconds. By doing this, the Weather 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. Again, disregard weather forecasts for the next 12 to 24 hours as this
will allow time for operation at a constant altitude.
THE WEATHER TENDENCY INDICATOR
Working together with the weather icons are the weather tendency indicators (the upward and
downward arrows located on the right hand side of the weather girl icon). 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.
Therefore, user may see how the weather has changed and is expected to change. For example,
if the indicator is pointing downwards together with cloudy icons, it means that the last noticeable
change in the weather was when it was sunny (the sunny icon only). Therefore, the next change
in the weather will be the cloudy 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.