What are the four fronts, what they are characterized by, and what weather they bring?
Warm front: warm air replaces cooler air. Light to moderate precipitation with lower clouds.
Cold front: cold air replaces warm air. More violent weather.
Stationary front: Flow of air on both sides is almost parallel to the line of the front. Surface position of front DOES NOT MOVE.
Occluded front: Active cold front overtakes a warm front. Complex weather.