Atmospheric stability refers to the tendency of air to resist vertical motion. When the atmosphere is stable, air parcels that rise will cool and become denser than the surrounding air, causing them to sink back down. This stability can lead to clear skies and calm weather conditions. Conversely, when the atmosphere is unstable, rising air parcels remain warmer and less dense than the surrounding air, allowing them to continue rising. This instability can result in cloud formation, thunderstorms, and other severe weather phenomena. Factors influencing stability include temperature gradients and moisture levels in the atmosphere.