system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can the fire that's going on in Canada cause it's own weather system that produces lightning.

This has also happened in the volcanic ash from eruption.
gpt
Lightning is simply static electricity in a cloud that is discharged into the ground.
In a thunderstorm, rain and ice droplets hit each other and transfer electrons, eventually forming a large enough charge difference for lightning to occur.
The fire, like a volcano, will be putting huge amounts of ash into the air. The ash behaves as the raid droplets would normally, exchanging charge until lightning is formed.