La Crosse Technology WS-3500 Operation Manual page 11

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Air Pressure (Press) in hPa or inHg (Default hPa).
Relative Air Pressure (Rel. Pressure) → To be set to the locally valid
reference air pressure with regard to the local height above sea level
(Default 1013,0 hPa).
Weather Tendency (Tendency) → Setting to a definite switching
threshold (2 hPa to 4 hPa) for a change in display of weather icons
(Default 3 hPa).
Storm Warning (Storm) → Setting to a definite switching threshold for
storm warning display at a decrease of air pressure from 3 hPa to 9
hPa over 6 hours (Default 5 hPa).
Activate/Deactivate storm warning alarm with ‫٭‬ON‫٭ / ٭‬OFF‫ ٭‬resp.
(Default OFF).
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