stationary front

A stationary front in meteorology is the boundary between two air masses where neither is replacing the other. This interface between air masses of different temperatures and densities can lead to weather changes, including thunderstorms and electrical activity.12

Fronts are classified by the movement of air masses. A cold front marks the leading edge of advancing cold air, often bringing showers and thunderstorms. A warm front occurs when warm air overrides retreating cold air, typically resulting in more widespread and uniform precipitation. An occluded front forms when a cold front overtakes a warm front. A stationary front, where there is little to no horizontal movement of the colder air mass, can sometimes develop into a wave cyclone with stormy weather. Clouds and precipitation often form on the poleward sides of warm and stationary fronts when warmer air is forced upward over colder air.23