An area is considered to have high barometric pressure when it has greater atmospheric pressure than the surrounding area. Normal barometric pressure is between 980 millibars and 1,050 millibars. High pressure systems are also referred to as anticyclones.Continue Reading
High pressure systems move in a clockwise motion in the Northern Hemisphere and counterclockwise in the Southern Hemisphere because of the Coriolis effect. The Coriolis effect is a result of Earth's rotation.
Low barometric pressure describes an area that has lower pressure than the surrounding area. Low pressure systems often bring high winds and warm air, leading to precipitation, clouds and potentially severe storms.Learn more about Weather Forecasts
Isobars are lines on a weather map that represent areas with equal atmospheric pressure. Each isobar line follows a path through locations with an equal atmospheric pressure that is plus or minus four starting with 1000 millibars.Full Answer >
The six basic elements of weather include temperature, humidity, atmospheric pressure, wind, precipitation and cloudiness. When combined, these elements can describe the weather conditions extant.Full Answer >
Temperature affects air pressure by causing the air to either become more or less dense, which expands or lowers its pressure. Warm air is less dense than cold air, and as air becomes less dense, its pressure increases.Full Answer >
A front is a boundary between air masses that leads to a low pressure system as the atmosphere attempts to even out the temperature contrast. If there is enough moisture in the air, the uplift as these two air masses collide causes rain. If the temperature differential is large enough, the collision leads to thunderstorms, according to NOAA.Full Answer >