Manual La Crosse WS-1516-IT (page 9 of 20) (English)

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(Every time a new average pressure value has been obtained (once per minute), this value is

compared with an internal reference value. If the difference between these values is bigger than

the selected weather tendency sensitivity, the weather-icon changes, either for worse or for

better. In this case, the current pressure value becomes the new weather tendency reference.)

If the icons do not change, either the air pressure has not changed or the change has been too

small for the Weather Center to register. So you may adjust the "sensitivity" of the pressure

change checking in the setting mode –see WEATHER TENDENCY SENSITIVITY VALUE

SETTING above.

However, if the icon displayed is a sun or raining cloud, 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.

Note:

After setting up, readings for weather forecasts should be disregarded for the next 48-60 hours.

This will allow sufficient time for the Weather station to collect air pressure data at a constant

altitude and therefore result in a more accurate forecast.

Common to weather forecasting, absolute accuracy cannot be guaranteed. The weather

forecasting feature is estimated to have an accuracy level of about 75% due to the varying areas

the Weather Center has been designed for use. In areas that experience sudden changes in

weather (for example from sunny to rain), the Weather Center will be more accurate compared to

use in areas where the weather is stagnant most of the time (for example mostly sunny).

If the Weather Center 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), discard the

weather forecast for the next 48-60 hours, as the Weather Center may 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 (arrow 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 bottom section of the LCD also shows the relative air pressure value and the air pressure

history.

Depending on programming conditions, display of the history of air pressure is in the form of a

graph consisting of vertical bars.

The bar graph of the electronic barometer shows the air pressure history of the past 12 hours in

five 3-hour steps.

The horizontal axis represents the last 12 hours air pressure recording (-12, -9, -6, -3 and 0 hour).

The bars are plotted at each of the 5 steps and give the trend over the recorded period. The

scale on the right compares the result. The "0" in the middle of this scale determines the current

air pressure.

The vertical axis represents the air pressure changes in inHg (+0.12, +0.06, 0, -0.06, -0.12. The

“0” represents the current air pressure). The newly measured pressure was compared to the

previously recorded pressure reading. The pressure change is expressed by the difference

between the current ("0h") and the past readings in division of ±2 hPa or ±0.06 inHg. If the bars

are rising, this indicates that the weather is getting better due to an increase in air pressure. If the

bars go down it indicates a drop of the air pressure and the weather is expected to get worse

from the present time "0".

ir pressure

changes in inHg

Air pressure

changes in hPa

At every full hour, the current air pressure is used as a basis for the display of a new graph bar.

The existing graph is then moved one column to the left.

Note:

For accurate barometric pressure trend, the Weather Center should operate at the same altitude.

For example, it should not be moved. Should the unit be moved, for instance from the ground to

the second floor of the house, the readings for the next 48-60 hours shall be discarded.

Note: The bar graph will scroll right to left regularly to prevent LCD burnout.

WIND DIRECTION AND WIND SPEED MEASUREMENT

In normal display mode, the second section of the LCD shows the following wind data.

 Wind direction (shown on the a compass scale of 16 divisions) and wind speed/ gust in

Beaufort scale

 Wind chill in F or C

 Wind Speed in km/h, mph or m/s

 Gust in km/h, mph or m/s (displayed when in Mode 2, by pressing the SET key shortly)

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La Crosse WS-1516-IT Manual

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