La Crosse Technology WS-9630U-IT-CA Instruction Manual page 22

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
arrow located near the Weather man). 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.
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