ECOWITT HP2552, Руководство по эксплуатации

Страница: 75 / 90

75
Pressure decreases for
a sustained period of
time Pressure rapidly
decreases
Pressure decreases for
a sustained period of
time,
and temperature
≤
0
℃
Storm Snowy
Pressure rapidly
decreases,
and
temperature
≤
0
℃
Lightning Alert
The lightning icon will appear if the Dew Point exceeds 70 F. This means
there is a chance of lightning storms forming.
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