A second Florida man was killed by lightning while working at a construction site.

The National Weather Service said a man in his 30s was killed Tuesday in Pembroke Pines. Another man was injured, but expected to recover.

This was the second lightning death in Florida this year and the third nationwide. In May, a Fort Pierce man was killed by lightning at a construction site in Jensen Beach.

It’s an unusually low number for this time of year. On average, the number of people killed by lightning by June 27 is 11, according to NWS lightning expert John Jensenius.

Officials told NBC Miami 6 that the man who died Tuesday had major burns to his chest and “what officials describe as exit wounds consistent with a direct lightning strike.”

“The safety for thunderstorms is pretty darn simple — don’t be outside,” said Ken Clark, an expert meteorologist with AccuWeather. “If you hear thunder, then you can be struck by lightning.”

Lightning forms when strong updrafts in towering cumulonimbus clouds force molecules to collide, creating an electric charge. Lightning rapidly heats a narrow channel of air to temperatures as high as 54,000 degrees, which prompts the emission of light and a crack of thunder as super-heated air expands rapidly, producing shockwaves.