The weight of the air above an object exerts a force upon that object, and this force is called pressure. Variations in pressure lead to the development of winds that play a significant role in shaping our daily weather. The purpose of this module is to introduce pressure, how it changes with height and how it is represented on weather maps. In addition, this module will introduce high and low pressure systems and their associated features.

The navigation menu (left) for this module is called "Pressure Module" and the menu items are arranged in a recommended sequence, beginning with this introduction. Click on the menu item of interest to go to that particular section. More details about the navigation system or the WW2010 web server in general are available About This Server.

Sections Definition
Defines pressure and introduces its various units of measurement.

Pressure with Height
Describes the vertical distribution of particles in the atmosphere and how pressure decreases with height.

Lines of constant pressure used to depict the pressure field on weather maps.

High Pressure Centers
Introduces high pressure centers, associated winds and weather conditions.

Low Pressure Centers
Introduces low pressure centers, associated winds and weather conditions.

Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.