center of action

A semipermanent high or low atmospheric pressure system at the surface of the earth; fluctuations in the intensity, position, orientation, shape, or size of such a center are associated with widespread weather changes.

Related terms:

• pressure center
• center jump
• pressure-fall center
• pressure-rise center
• storm center
• katallobaric center
• center of rises
• center of falls
• anallobaric center
• frost action