A cold front advancing on a warmer air mass will force the warm air mass upward (cold air sinks and hot air rises).
The warm air rushes quickly upward causing rapid cooling and condensation of water vapor. In summer, thunderstorms will often accompany fast-rising warm air; in winter, a snowstorm can form.
Once the cold front has pushed its way under the warm air, the surface temperature in that region will drop sharply.
See also:
- What Happens When a Warm Front Meets a Cold Front?
- What Is an Occluded Front and How Is It Formed?
- What Is a Stationary Front and How Is It Formed?
- Why Is There No Lightning In a Snowstorm and Why Are There More Thunderstorms In the Tropics?
- How Do Penguins Prevent Their Feet From Freezing In the Winter and How Do Penguins Stay Warm In the Cold?

2 Comments
Thank you.. to whom ever made this page. This helped me so much with my Gepa practice sheet. I was amazed on how certain and straight forward this site gave me the information.
yeah, it helped me with my science weather project