Warm Air Front • Warm air replaces cold air • warm air mass=higher temperature=lesser density • Rainfall increases as the front approaches
Cold Air Front http://www.youtube.com/watch?v=xdgqkc2YJ1Q • Cooler and denser air wedges under the less-dense warmer air, lifting it • Upward motion causes lowered pressure along the cold front • Cold fronts can move up to twice as fast as warm fronts and can produce sharper changes in weather. • Since cold air is denser than warm air, it rapidly replaces the warm air preceding the boundary. • Cold fronts are usually associated with low-pressure areas.
Fronts • http://www.youtube.com/watch?v=vPC5i6w3yDI