Satellite Data Reveals World’s Longest Lightning Strike in U.S.

The World Meteorological Organization has officially recognized a lightning strike that stretched an astonishing 829 kilometers (515 miles) across the central United States as the longest ever recorded.

Known as a “megaflash,” the electrical discharge took place in 2017 during a massive thunderstorm system spanning from Texas to Missouri. While the event happened years ago, it has only now been confirmed thanks to advanced satellite data from NOAA’s GOES-16 weather satellite, which was still in early use at the time.

Megaflashes occur in large storm complexes, where lightning spreads horizontally across cloud tops instead of striking vertically. These rare events pose risks to aviation and infrastructure because of their massive reach and unpredictable nature.

Scientists say the discovery highlights how modern satellite technology is transforming our ability to monitor lightning on a global scale. The flash caused no reported damage on the ground but demonstrates the growing complexity of extreme weather systems.

With new satellites now covering regions beyond North America, experts expect even more lightning records to emerge, offering critical insights into storm behavior and the threats they pose.