La Crosse Technology WS-9119U Instruction Manual page 15

WEATHER FORECAST AND WEATHER TENDENCY:
WEATHER FORECASTING ICONS:
There are 4 weather icons in the fourth section of LCD that can be displayed in any of the following combinations:
Sunny Cloudy with sunny intervals
For every sudden or significant change in the air pressure, the weather icons will update accordingly to represent the
change in weather. If the icons do not change, then it means either the air pressure has not changed or the change has
been too slow for the intelligent weather station to register. However, if the icon displayed is a sun or rainy, there will be
no change of icon if the weather gets any better (with sunny icon) or worse (with rainy icon) since the icons are already
at their extremes.
The icons displayed forecasts the weather in terms of getting better or worse and not necessarily sunny or rainy as
each icon indicates. For example, if the current weather is cloudy and the rainy icon is displayed, it does not mean that
the product is faulty because it is not raining. It simply means that the air pressure has dropped and the weather is
expected to get worse but not necessarily rainy.
The change of weather forecast icon is in accord to the relationship between current relative pressure and the pressure
change since last three hours.
If the weather is changing, both old weather icon and new weather icon will be shown with weather tendency indicator
(animated arrows). If the weather has not changed within 6 hours, only the new weather icon in the middle display will
be shown.
Examples of changing weather icons:
Note:
After initial set up of the intelligent weather station with the setting of the relative value, readings for weather forecasts
should be disregarded for the next 12-24 hours. This will allow sufficient time for the intelligent weather station to collect
air pressure data at a constant altitude and therefore result in a more accurate forecast.
If the intelligent 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), set again the relative air pressure value, and discard
the weather forecast for the next 12-24 hours. By doing this, the intelligent 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.
AIR PRESSURE TENDENCY INDICATOR
The air pressure tendency indicators are located on the left side of the air pressure display, below the weather icons,
and they work independently from the weather forecast icons. The air pressure tendency indicator pointing upward or
downward directions is displayed based on comparing the difference of the air pressure recorded during a full hour time
frame.
Note:
•
A single air pressure tendency indicator will point upward or downward when the difference in air pressure
registered is between 0.03 and 0.09 inHg (1 and 3hPa) within 4 hours.
•
Two air pressure tendency indicators pointing upward or downward will be displayed when the air pressure
difference has increased or decreased by 0.09 inHg (3hPa) or more within 4 hours.
Cloudy Rainy
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