User blog comment:EvanDude345rv5/Fairy Tail 362 Rant : WTF ? Happy surviving a nuke/@comment-122.52.143.112-20131130014021/@comment-7418318-20131201085354

I guess this is as good a place as any to point it out:

Any sufficiently strong and hot explosion will leave a mushroom cloud. That has nothing to do with the nuclear reaction itself.

Even some sufficiently big volcano eruptions made similar mushroom clouds.

Also considering that the explosion happened so high up in the air that the ground wasn't touched would make it impossible for there to be a mushroom cloud either way, even if it had been a nuclear bomb. Because those clouds consist of stuff thrown up from the ground. Without touching the ground, no stuff get's thrown into the atmosphere, and thus no mushroom.

Not that I think it was a nuke either, but just the presence or absence of the mushroom cloud is saying absolutely nothing.