An instrument that measures atmospheric pressure. Falling pressure indicates approaching storms; rising pressure signals clearing weather.
forecastingWhat is Barometer?
Barometers come in two main types: mercury barometers (a column of mercury in a glass tube) and aneroid barometers (a sealed metal chamber that expands and contracts with pressure changes). Digital barometers in smartphones use microelectromechanical systems (MEMS) sensors. The rate of pressure change (barometric tendency) is one of the oldest and most reliable short-term weather forecasting methods.
Key points
- An instrument that measures atmospheric pressure. Falling pressure indicates approaching storms; rising pressure signals clearing weather.
- Category: forecasting
Related terms
See also: barometer is connected to other weather concepts. Browse the full glossary for related definitions.