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[*]Add a new layer and fill it with black
[*]Add a new layer
[*]Set foreground to yellow, background to red
[*]Create irregular selection(s) with "lasso tool"
[*]Select filter / render / clouds (sometimes you need to use it more than once to get the desired effect; CTRL+F)
[*]Deselect
[*]Add filter / blur / gaussian blur (40)
[*]Add a new layer
[*]Set foreground to black, background to white (shortcut: D)
[*]Set blending mode to "color dodge"
[*]Select filter / render / clouds (sometimes you need to use it more than once to get the desired effect; CTRL+F)
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When you're done, also try out some other Gaussian blur values or extra/different selections.
Have fun and if anybody else has some ideas to make this explosion more realistic, please feel free to comment.