The 515-mile bolt stretched from East Texas to near Kansas City, Mo., a roughly eight-hour distance by car, according to the World Meteorological Organization. In comparison, the average bolt of lightning measures less than 10 miles, according to the National Weather Service.

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,