A groundbreaking study released this Tuesday in the Geophysical Research Letters journal has revealed an incomparable thunderstorm sparked by electrically-charged ash, supercooled water, and hailstones in a volcanic plume after the 2022 eruption of the Hunga Tonga-Hunga Ha'apai underwater volcano.
The storm, described as extraordinary, unleashed a whopping 192,000 lightning flashes, comprising almost half a million electrical pulses, climaxing at 2,615 flashes per minute.
NASA equated the explosive power of the erupted Tonga submarine volcano to over 100 Hiroshima bombs detonating at the same time. As the volcano erupted, its magma came into contact with seawater, instantly turning it into vapor. This resulted in a massive mushroom cloud composed of ash, gas, and upwards of 50 million tons of water vapor soaring up the sky.
What was unusual was that some lightning bolts reach up to 19 miles (30 kilometers) above sea level. This is considered the highest altitude for lightning flashes ever recorded.
This phenomenon is something "we've never seen before," according to Alexa Van Eaton, US Geological Survey's volcanologist and the study's lead author. The volcanic billows can create more intense lightning than ordinary thunderstorms, including those from supercell storms and tropical cyclones, she suggested.
The study used data from four sources, including NASA's Geostationary Lightning Mapper, a satellite tool that tracks lightning from space. It discovered that the lightning followed the expansion of the volcanic columns, creating expansive rings.
"These lightning rings were unlike anything we've ever seen. There's no comparison in meteorological storms," Van Eaton stressed.
Interestingly, the volcanic clouds from the Hunga Tonga-Hunga Ha'apai eruption lasted for a minimum of 11 hours, which is much longer than the expected 1-2 hours. This means that tracking lightning activity could be an innovative way to estimate the duration of volcanic eruptions. "This discovery presents a new, light-speed method for monitoring volcanoes, aiding the USGS in providing ash hazard advisories to aircraft," Van Eaton concluded.