There has been a lot of talk about antimatter, not just in Superman comics but also in regards to the CERN collider.  However, there may have been antimatter in an actual thunderstorm and this article sheds light on the findings:

Although powerful storms have been known to produce positrons — the antimatter versions of electrons — the antimatter observed by Dwyer and his team cannot be explained by any known processes, they say. “This was so strange that we sat on this observation for several years,” says Dwyer, who is at the University of New Hampshire in Durham.

Let’s find out more about this discovery on page 2

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