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During isobar divergence, which refers to the spreading out of air in a horizontal direction at the same altitude, typically associated with a low-pressure system, air masses become destabilized. This process occurs because as air diverges at the surface, it creates an area where air is rising aloft to replace the outward-moving air. As the air rises, it can lead to the cooling of air parcels and condensation, potentially resulting in cloud formation and precipitation.

The destabilization of air masses is significant because it often contributes to the development of storms or other weather phenomena. The process enhances vertical mixing and allows for greater moisture and heat exchange in the atmosphere, which can further modify local weather patterns.

Understanding this aspect of isobar divergence is essential for meteorologists and dispatchers, as it helps predict weather changes that could impact aviation operations.