I WONDER - How Hot Is Lightning?

The video discusses lightning, explaining that while it doesn't have a temperature itself, it can heat the surrounding air to 25,000 degrees Celsius, which is nearly five times hotter than the sun's surface. Lightning can occur without rain and its intense heat can cause forest fires if there is no rain to dampen the trees.

What can the extreme heat of lightning cause in the absence of rain?

Describe the relationship between lightning and forest fires.