Treetops across America’s heartland secretly sparkle with invisible electrical discharges during thunderstorms, a century-old mystery now confirmed by science—revealing nature’s raw power hidden from the naked eye.
Story Highlights
- Researchers captured the first wild footage of ultraviolet corona sparks from leaf tips on trees like sweetgum and loblolly pine during 2024 storms.
- Penn State team used a modified minivan with UV cameras to document 41 “hopping” coronas in one 90-minute chase in North Carolina.
- These ghostly blue glows precede lightning, validating long-speculated atmospheric electrification processes.
- Findings published in Geophysical Research Letters in 2026 offer new tools for measuring tree currents and storm risks.
- Experts hail the breakthrough for bridging lab theory to real-world thunderstorms from Florida to Pennsylvania.
Historic First Capture in the Wild
Researchers from Pennsylvania State University filmed electrical corona discharges from treetop leaf tips during summer 2024 thunderstorms across the eastern U.S. The team documented faint ultraviolet glows on sweetgum trees in Pembroke, North Carolina, capturing 41 coronas over 90 minutes. These sparks lasted up to three seconds each, jumping between leaves in a phenomenon called “hopping.” The mobile lab van, a 2013 Toyota Sienna equipped with UV cameras and a periscope, pierced ambient light to reveal nearly invisible emissions. Observations extended to loblolly pine and other species in four more storms from Florida to Pennsylvania.
Century of Speculation Meets Proof
Speculation about treetop coronas began nearly a century ago from electric field anomalies in forests. Lab experiments over 50 years confirmed the mechanism: negatively charged storm clouds induce positive charges that climb tree trunks to leaf tips, creating fields strong enough to ionize air into glowing plasma. Previous simulations with charged plates over leaves produced faint blue glows, and potted trees emitted UV proportional to electrical current. Anecdotal reports of vegetation glows existed, but no wild footage until 2024. Lead author Patrick McFarland’s team bridged this gap with field proof.
Mobile Lab Innovation Drives Discovery
Patrick McFarland, a Pennsylvania State University meteorologist, led the chase using the improvised UV setup on the minivan for real-time monitoring. Post-analysis showed flashes coinciding with branch sway during intense storms. McFarland described potential “light shows” from dozens to hundreds of simultaneous coronas on leaves, invisible without specialized cameras. The study appeared in Geophysical Research Letters earlier in 2026, with coverage confirming five total observations. Plans now include using UV emissions to gauge tree currents non-invasively.
Supporting experts praised the feat. Joseph Dwyer of the University of New Hampshire called it a tough measurement addressing thunderstorm electrification gaps. Richard Sonnenfeld from New Mexico Institute of Mining and Technology linked tree coronas to cloud streamers, precursors to lightning. Evan Gora of the Cary Institute noted trees’ resilience despite lab burns on leaf tips.
Impacts on Storms, Trees, and Science
The validation aids models of landscape electrification and streamer formation before lightning strikes. Short-term benefits include non-invasive tree current measurements via UV. Long-term, it may reveal evolutionary tree adaptations, like pointed leaves shaped by millennia of discharges. Coronas generate hydroxyl radicals that cleanse methane but also form ozone and aerosols, affecting atmospheric chemistry. Forest ecologists gain tools for damage studies, while thunderstorm-prone communities benefit from better lightning prediction. Economic effects remain minimal, bolstering research funding in meteorology and ecology.
Sources:
First researchers film treetops glowing during thunderstorms
Scientists record mysterious blue electrical sparks above treetops during storms for the first time
Thunderstorms conjure ghostly coronae above treetops
Trees glow during thunderstorms and scientists finally caught it on camera
