An elongated area of low air pressure is a trough . An elongated area of high air pressure is a ridge . Cutoff lows can bring bad weather. They can also cause the atmosphere to become more unstable . Strong upper-level disturbances can cause a trough to become negatively tilted , leading to intense storms.
Text explains differences between station pressure, sea level pressure and altimeter setting.
Air pressure helped explain why baseballs travel farther at higher elevations than at lower elevations. There is an integrated weather unit bringing together math, science, geography with weather, beginning with lessons on basic concepts such as air and pressure. The University of Illinois' Forces and Winds online meteorology guide , helps introduce and define important concepts of pressure and wind. Cold fronts don't necessarily bring frigid weather. Warm fronts often bring widespread precipitation.