What's the difference between a warm front and a cold front?
Any front marks the boundary between differing air masses; in the case of a warm front, it marks the boundary between cold air and warm air that's replacing the cold air. In the case of a cold front, it marks the boundary between warm air and colder air that's replacing the warm air.
We forecast the movement of fronts by analyzing temperatures at or near the surface of the earth, surface wind directions together with the direction and strength of winds farther up in the atmosphere, and even the type of clouds showing up on satellite photos.
