A freak lightning storm battered a California beach, killing a 20-year-old man with a blast of electricity and injuring 13 more along the coast.

Beachgoers watched a big storm roll across the horizon, but had no idea it was headed their way and would zap about a dozen people along the Venice Beach Boardwalk.

When the lightning hit at about 2:20 p.m., it sounded like “just one big explosion,” Ruben Tumbaga, 36, told the Daily News.

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