A cold front is formed when a cold air mass and a warm air mass meet and the cold air mass goes under the warm air and pushes it up. It produces cumulus or cumulonimbus clouds and there is thunderstorms or snow or hail. After it passes the air will be cold and dry. And it will become very cold
A stationary front is formed when a cold air mass and a warm air mass meet but non of them have the power to move each other. It will bring gentle rain or light snow for a few days
A occluded front is formed when two cold air masses hit a warm air mass and splits the warm air mass in two directions. It brings thunderstorms and bad weather like that
What are weather fronts?