It lit up the Long Island sky.

A 10-mile long bolt of lightning caused quite a spectacle when it appeared in the sky over Bayport, Long Island Wednesday night.

The natural wonder illuminated the sky behind the waterfront home of retired FDNY fireman Kenny Gunther — and luckily he caught it on camera.

A bolt of lightning appeared behind the Bayport, Long Island home of Kenny Gunther, who captured it on camera. Kenneth Gunther

Gunther told The Post he was watching TV when he felt the floor under his feet rumbling, and then saw a flash outside his window.

“I just grabbed my iPhone and I just stick it on the windowsill in my bedroom facing south with their widest angle, and I just had it record,” he recalled.

“I turn all the lights off and I’m just sitting there quiet. And then all of a

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