La Crosse Technology WS-9626U-IT Manuel D'instructions page 38

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.
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