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Page 20
The forecast icon is based on the rate of change of barometric pressure. Please allow at least one month
for the weather station to learn the barometric pressure over time.
Sunny
Partly Cloudy
Cloudy
Rainy
Stormy
Pressure
increses for a
sustained
period of time
Pressure increases
slightly, or initial
power up
Pressure decreases
slightly
Pressure decreases
for
a
sustained
period of time
Pressure
rapidly
decreases
Figure 19
6.5.2
Wireless Signal Quality Icon
The wireless signal strength displays reception quality. If no signal is lost, the signal strength indicator
will display 5 bars. If the signal is lost once, four bars will be displayed, as shown in Figure 20. A bar
is removed for each consecutive loss of signal.
Five Bars
Four Bars
No signal loss
Lost signal once
Figure 20
6.5.3
Weather Forecasting Description and Limitations
In general, if the rate of change of pressure increases, the weather is generally improving (sunny to
partly cloudy). If the rate of change of pressure decreases, the weather is generally degrading (cloudy,
rainy or stormy). If the rate of change is relatively steady, it will read partly cloudy.
The reason the current conditions do not match the forecast icon is because the forecast is a prediction
24-48 hours in advance. In most locations, this prediction is only 70% accurate and it is a good idea to
consult the National Weather Service for more accurate weather forecasts. In some locations, this
prediction may be less or more accurate. However, it is still an interesting educational tool for learning
why the weather changes.
The National Weather Service (and other weather services such as The Weather Channel) have many
tools at their disposal to predict weather conditions, including weather radar, weather models, and
detailed mapping of ground conditions.