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Definition: Stability or atmospheric stability is a term used to describe the convective properties of an air mass. Air that is rising is When a cool air mass moves over a warmer region, the warm surface will heat the parcel of air from below. The start of this convective process will create an air mass that is less stable as the temperature can change quite rapidly.

If a warm air mass moves over a cold surface, the air becomes more stable as the convective processes in the air slow. The more stable the air mass, the less likely a region will receive precipitation.

The weather map symbols used for the stability of an air mass are s for stable and u for unstable. Each is used as a subscript beside the classification of the air mass.

Also Known As: Stable air

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