Our weather stations base forecast on rate of change of pressure. This does not predict what is happening outside, but rather, if the weather will change in the next 24 to 48 hours due to changes in barometric pressure.

In general, if the rate of change of pressure increases, the weather is improving (sunny). If the rate of change of pressure decreases, the weather is degrading (cloudy or rainy). If the rate of change is relatively steady, it will read partly cloudy or partly sunny (depending on the type of weather station).

The reason the current conditions do not match the forecast icon is because it 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.

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.  Thus, these forecasts are significantly more accurate then forecasts based on rate of change of pressure.

You will need to give the weather station enough time to predict changes in weather. This can take up to 30 days, depending on where you live.

FAQs:

  1. The icons on my weather station have not changed in the short time I have owned it. You will need to give the weather station enough time to predict changes in weather. This can take up to 30 days, depending on where you live.
  2.  Can I change the set points that trigger changes in the forecast icon?  With some Ambient Weather Stations (not most), there is the option “Pressure Threshold Setting”. The pressure threshold (the negative or positive rate of change of pressure signifying a change in the weather) can be adjusted by the user from level 2 to level 4 (default level 2 mbar/hour). Check your User’s Manual for this feature.  The lower the level pressure threshold setting, the higher sensitivity for weather forecast changes. Locations that experience frequent changes in air pressure require a higher setting compared to locations where the air pressure is typically stagnant.

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