system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the weather usually pleasant after a thunderstorm?
gpt
Thunderstorms generally occur when a cold front moves in a warm area. The way fronts work is that the colder ones shove the warm air mass upwards since cold air is more dense. In this same way, the warm air has more energy than the cold does, so when the cold from moves in, the air is calmer. Often during the summertime a little cooler weather is welcome along with the stillness that occurs.