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Home Science & Environment Space Exploration

New world record! Weather satellites detect 515-mile-long lightning flash

July 31, 2025
in Space Exploration
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A map with a series of red, blue, and green dots showing where lightning strikes have happened in the U.S.
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It’s 2017, and a thunderstorm shoots off a lightning bolt. What’s so special about that, you ask? Well, the bolt is an astonishing 515 miles (829 kilometers) long.

Using archival satellite data, researchers just officially confirmed the length of this enormous bolt of lightning that stretched from Texas to Missouri. It sets a new world record, besting the previous title holder — a 477-mile (768-km) bolt from 2020 — by 38 miles (61 km).

“​​We call it megaflash lightning and we’re just now figuring out the mechanics of how and why it occurs,” Randy Cerveny, an Arizona State University professor who contributed to the study, said in a statement.


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Megaflash lightning is defined as a lightning bolt that reaches at least 62 miles (100 km) in length. By comparison, the average lightning bolt measures less than 10 miles (16 km) in length. (Fun fact, most lightning is just an inch or so wide.)

To determine this length of the record-holding megaflash, the team reviewed data from the National Oceanic and Atmospheric Administration’s GOES-16 satellite, which is equipped with a lightning mapper that observes about one million bolts per day. Their analysis determined the true length of the bolt: a whopping 515 miles.

So, how exactly does one measure a megaflash? Previously, researchers used ground-based radio networks to track lightning bolts. However, satellites with lightning mappers are updating the process.

GOES-16 satellite image recording a record-setting 515-mile ligtning megaflash during a storm in October 2017. Red circles mark positively charged branches of the lightning, and blue circles mark negatively charged branches. (Image credit: NOAA)

“Adding continuous measurements from geostationary orbit was a major advance,” Michael Peterson of Georgia Tech Research Institute, who served as lead author of a paper on the study, said in the statement. “We are now at a point where most of the global megaflash hotspots are covered by a geostationary satellite, and data processing techniques have improved to properly represent flashes in the vast quantity of observational data at all scales.”

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Megaflashes like these are quite rare — less than one percent of thunderstorms produce them. Typically speaking, the thunderstorms that indeed manage to produce them must be churning for 14 hours or more, covering an area at least the size of the state of New Jersey, per Peterson’s research.

Those conditions aren’t altogether that rare, to be fair. And, as our lightning-mapping satellites collect new data, we’ll probably start noticing even more megaflashes. “It is likely that even greater extremes still exist, and that we will be able to observe them as additional high-quality lightning measurements accumulate over time,” said Cerveny,

A paper on the research was published in the Bulletin of the American Meteorological Society.

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