The warm air mass is pushed up and the weather becomes cool and stormy.
If you mean when a mass of cold air meets a mass of warm air, then a front is created.
A warm front forms.
What happens is similar to when a warm air mass meets a cold air mass: the Cold Air Mass is forced to Subside beneath the Warm Air Mass. Thusly the warm air is uplifted, it cools and Rain is formed. When a Warm Air Mass meets a Cold Air Mass, the warm air is [again] forced to Rise above the Cold Air Mass, it cools and Rain is formed.
a front
A warm front forms.
Hiwhat happens when exposed air meets foodThank you.
A cold front.
A cold front.
Stationary front
A cold air mass comes in under a warm air mass.
its a stationary front
A cold front develops, often resulting in precipitation, and sometimes thunderstorms.