There's no way within the game for you to do this yourself, but if you're talking about modding the game to do this, perhaps one of the modders can help you out here .
The fire storm is not part of a "map" it is a scripted event.
So as FP says you can't do it as a separate map but it could be done in theory in a modified game.
I would not even try it as it would mean a lot of work for little reward.
Weeks or months for a few minuets play.
That's because you don't understand that scripted events are not held in any file that you are familiar with.
From memory of 7-8y ago it is the decompiled .CHL files you need to modify then re-compile.
That is the end of what I think I can remember so no more help from me.