Is "It thunders" incorrect expression?

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Aug 18, 2012 13:03
Hello!
Now I have a question.
When I say"It thunders", I was said "Thunder is not a verb, so you cannot write so" by my friend.

But web dictionary says it can be used as a verb.
Of course I know dictionary sometimes says incorrect expressions.

So I want to know "It thunders" is merely unnatural or incorrect.
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