515-Mile-Long ‘Megaflash’ of Lightning Sets a New World Record, Spanning Eastern Texas to West-Central Missouri In October 2017, lightning stretched across multiple Great Plains states, and a ...

On Thursday, the World Meteorological Organization certified the record for the longest single lightning bolt ever measured on Earth: a 515-mile long “megaflash” occurring over the southern ...

A lightning flash that extended 515 miles from eastern Texas to near Kansas City, Missouri, in 2017 is recognized as being the longest horizontal distance.