So let's assume that for some reason with 24 hours to play with I can't evade an oncoming firestorm and need to find or make shelter. IF (that's the big if) I saw the terrain and realized there was a piece where I could control a fire and not kill myself in the process or add to the coming firestorm, I'd burn off an area in which to make my stand. Then, not finding a cave, I'd dig down, deep (shovel) and cover the top with timbers (axe) and cover that with as much dirt as I took out of the ground. So I'd have a hopefully fireproof bunker. Then, as the fire approached, I'd set a backfire to remove even more fuel directly in the path of the fire. Then I'd scramble into the bunker as the fire did what fires do.

While sitting in my little dirt covered shelter (hoping it doesn't turn out to be a little one man oven) I should have time to think about what I'll say when the fire investigators ask me: if I had so much time to build such a great shelter, why did I not leave? Good question.