Weather Forecasting; Weather Forecasting Description And Limitations - Ambient Weather WH2902 User Manual

No signal loss
6.16

Weather Forecasting

The five weather icons are Sunny, Partly Cloudy, Cloudy, Rainy and Stormy.
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
Pressure Pressure
increses for a increases
sustained slightly,
period of time initial
up

6.16.1 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 Accuweather and The Weather
Channel) have many tools at their disposal to predict weather conditions, including weather radar,
weather models, and detailed mapping of ground conditions.
Version 1.0
Figure 24
Cloudy
Pressure
decreases
or slightly
power
Figure 25
Lost signal once
Rainy Stormy
Pressure Pressure
decreases for a rapidly
sustained decreases
period of time
Snowy
Pressure
decreases for
a sustained
period of
time and
temperature
is below
freezing
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