Question

What causes tornado?A "front" form between a cold air mass and a warm air mass. Sometimes a cold air mass move in above the warm air.

Answer 1

Explanation:

Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. ... When it touches the ground, it becomes a tornado

In other words, a cold front is right at the leading edge of moving cold air and a warm front marks the leading edge of moving warm air. When two air masses meet together, the boundary between the two is called a weather front