If the boundary between the cold and warm air masses doesn't move, it is called a stationary front. The boundary where a cold air mass meets a cool air mass under a warm air mass is called an occluded front. ... Because cold air is denser than warm air, cold fronts are able to force warm air out more quickly.
If the boundary between the cold and warm air masses doesn't move, it is called a stationary front. The boundary where a cold air mass meets a cool air mass under a warm air mass is called an occluded front. ... Because cold air is denser than warm air, cold fronts are able to force warm air out more quickly.