The megaflash occurred in October 2017, during a major thunderstorm complex. It extended from eastern Texas to near Kansas City - equivalent to the distance between Paris and Venice in Europe. It would take a car about eight to nine hours and a commercial plane at least 90 minutes to cover that distance.

“Lightning is a source of wonder but also a major hazard that claims many lives around the world every year and is therefore one of the priorities for the international Early Warnings for All initiative. These new findings highlight important public safety concerns about electrified clouds which can produce flashes which travel extremely large distances and have a major impact on the aviation sector and can spark wildfires,” said WMO Secretary-General Celeste Saulo.

WMO’s Committee on Weather and Climate Extremes, which maintains official records of global, hemispheric and regional extremes, recognized the new record with the help of the latest satellite technologies. The findings were published in the Bulletin of the American Meteorological Society.

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