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the boundaries between air masses
A front is defined as the transition zone between two
air masses of different density.
Fronts extend not only in the horizontal direction,
but in the vertical as well. Therefore, when referring to the
frontal surface (or frontal zone), we referring to both the horizontal
and vertical components of the front.
[Image: cross section of cold front (27K)]
The types of fronts discussed in this module include:
Last Update: 07/25/97
A front that is not moving.
Leading edge of colder air that is replacing warmer air.
Leading edge of warmer air that is replacing cooler air.
When a cold front catches up to a warm front.
Separates a moist air mass from a dry air mass.