1. A0120 Absolute topography Shape of an isobaric surface, as represented by the contour lines (heights above mean sea-level) drawn on a synoptic chart.

2. A1150 Air-mass analysis Identification of the various air masses on a synoptic chart or aerological diagram and the determination of their physical characteristics and development.

3. Often, particularly in synoptic meteorology, Advection refers only to the horizontal or isobaric components of motion, that is, the wind field as shown on a synoptic chart.