How does the weather change as air pressure at Earths surface rises and falls?
High pressure is the result of sinking air in the atmosphere, which usually corresponds with clear skies. Low pressure indicates rising air, which cools and condenses, forming clouds and precipitation. So, in general terms, if the pressure is rising at your location, that means that high pressure is building in and skies should gradually clear. If your barometer reading is dropping, that means that low pressure is on the way and stormy weather can be expected. Barometers measure atmospheric pressure. Find out how barometers work on this USA TODAY resource page.
