A lightning strike that stretched from Texas to Missouri in 2017 was recently certified as the longest single lightning flash in recorded history. The strike stretched a distance that would take nearly nine hours to drive.

The World Meteorological Organization says a lightning bolt that was visible for some 515 miles from eastern Texas through Missouri in October 2017 is now considered to be the world’s longest.

In October 2017, lightning flashed across the sky in America’s heartland. But this wasn’t your average storm. The single, enormous bolt—known as a “megaflash”—stretched across multiple states, from eastern Texas to west-central Missouri,