A front is the boundary between two masses of air. Fronts can either be warm fronts or cold fronts. On weather maps, warm fronts are represented by red semi-circles and cold fronts are represented by blue triangles.
Cold Fronts:
A cold front is the boundary between a mass of cold, dry air and a mass of warm air. The cold air mass moves into and pushes under the warm air mass. The cold air mass is able to push under the warm air mass because it is more dense. This causes the warm air mass to rise. If enough moisture is present, rain and thunderstorms can form ahead of the cold front boundary.
Warm Fronts:
A warm front is the boundary between a warm air mass and a cold air mass. In this case, the warm air mass is moving into the cold air mass. The warm air mass rises over the cold air mass because it is less dense. If enough moisture is present, this can lead rain and snow along the front of the boundary.
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