How do warm and cold fronts form?

Cold Front;. Marked on a map with a blue line and blue triangles pointing towards the warm air. Slopes of 1/50 to 1/150. Associated with cumulus &cumulonimbus clouds ahead of the front in the warm air, producing showers and thunderstorms. read more

Because the cold front is much, much steeper than the warm one, the weather is more unstable. Shifty and gusty wind, rain showers, and sometimes, thunderstorms. As the cold front moves faster, it ends up by merging with the warm one on its anti-clockwise spin (in the northern hemisphere). read more

Cold fronts are formed when air masses that consist of cooler heavier air move in to displace warmer air. An air mass is a large body of air that shares a relatively uniform temperature and level of humidity. read more