Both are ok. But you need a double hyphen before "lightning". What comes first -- lightning or thunder?
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IvanhrBoth are ok. But you need a double hyphen before "lightning".A comma is fine, in my opinion.
fivejedjon IvanhrBoth are ok. But you need a double hyphen before "lightning".A comma is fine, in my opinion.Yes, I suppose so.
enoon IvanhrYes.What is this double hyphen of which you speak?What would you call it then?
enoonThe only one of those that can go in the original sentence is an em dashI made a mistake (the sign I wrote is not a double hyphen). As for a comma being better, I won't object to that.