Answer:
A boundary between cold storm and warm storm.
Step-by-step explanation:
The storm happens when the mass of cold air enters into the warm air region. The cold air mass is called cold air front. It pushes the warm air when it meets in a single boundary. As a result, thunderstorm happens. The warm air becomes cold, precipitate, and starts raining. The front is a boundary between the warm air mass and cold air mass. As the warm air lighter, it goes up, the cold air fills vacant space and storm occurs. There are different types of air front such as cold front, warm front, stationary front. But in front strong wind blow, rain, thunder occurs.