La Crosse Technology WS-9037U-IT - Manual (Page 19)

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hours. 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.
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.
AIR PRESSURE HISTORY (ELECTRONIC BAROMETER WITH
BAROMETRIC PRESSURE TREND)
The third section of the LCD also shows the relative air pressure value and
the air pressure history.
The bar chart indicates the air pressure history trend over the last 24 hours
in 7 steps, 0h, -3h, -6h, -9h, -12h, -18h, and -24h. The “0h” represents the
current full hour air pressure recording. The columns represent the “hPa”
(0, ±2, ±4, ±6) at specific time. The “0” in the middle of this scale is equal to
the current pressure and each change (±2, ±4, ±6) represents how high or
low in “hPa“ the past pressure was compared to the current pressure.
If the bars are rising it means that the weather is getting better due to the
increase of air pressure. If the bars go down, it means the air pressure has
dropped and the weather is expected to get worse from the present time
“0h“.
Note:
For accurate barometric pressure trends, the Weather Station should
operate at the same altitude for example, it should not be moved from the
Air pressure over the last 24 hours