A good quality weather station incorporates a pressure sensor and outdoor temperature and humidity sensors. Using the information supplied by these instruments the weather station can make fairly accurate predictions of approaching weather.
This is very simply the that is sitting on top of your location. weather station can make fairly accurate predictions of approaching weather.
In areas of low air pressure, the air is less dense and relatively warm, which causes it to rise. The expanding and rising air naturally cools, and the water vapor in the air condenses forming clouds and the drops that fall as rain. Conversely, in High pressure areas the air is more dense and relatively cool, which causes it to sink. The water vapor in the sinking air does not condense, leaving the skies sunny and clear.