Ball lightning can be dangerous, though encounters are rare and most observed instances dissipate harmlessly within seconds. The phenomenon has been linked to severe burn injuries and at least one well-documented death. Because ball lightning occurs during thunderstorms and carries significant energy, treating it with the same caution as any lightning-related event is the safest approach.
Documented Injuries and Deaths
The clearest medical evidence comes from a case published in the Annals of Plastic Surgery, describing a 28-year-old man and his 5-year-old daughter who were burned after ball lightning entered their home through a chimney. Both patients showed signs of fire and electrical injuries. The father lost consciousness and sustained second-degree burns on his face and a deep second-degree burn on his right hand, covering about 4% of his body. His daughter was hurt far more seriously, with second- and third-degree burns across 30% of her body, affecting her face, neck, both upper arms, and back. These were reported as the first documented cases of indoor burn injuries from ball lightning contact.
The most famous fatality dates to 1753. Georg Wilhelm Richmann, a physics professor at the Russian Academy of Sciences in St. Petersburg, was studying atmospheric electricity in his home when a small ball of lightning leaped from his experimental apparatus to his forehead, killing him instantly. An engraver standing nearby witnessed the event and described an explosion that scattered objects around the room and started a fire. Richmann’s death is considered the first fatal casualty of electrical research, and it halted similar experiments across Europe for years.
What Ball Lightning Actually Does
Eyewitnesses typically describe a glowing sphere, often the size of a grapefruit to a basketball, that drifts through the air during or just after a thunderstorm. It persists for roughly 1 to 10 seconds before vanishing, sometimes silently and sometimes with a violent explosion. The energy content of ball lightning varies widely. A compilation of 17 of the most energetic observations found that some cases exceeded what any self-contained chemical reaction could reasonably produce, suggesting the phenomenon taps into energy from the broader lightning event that spawned it.
One of the more unsettling properties of ball lightning is its apparent ability to enter enclosed spaces. Researchers have catalogued at least 43 cases of ball lightning penetrating indoors, sometimes passing through window glass without breaking it. One theory proposes that ball lightning consists of intensely circulating light trapped within a compressed shell of air. In this model, the light component passes through glass the way ordinary light does, then re-forms on the other side. This means being indoors with windows closed does not necessarily prevent an encounter, though such events remain extremely uncommon.
Why It Forms
Scientists still don’t fully agree on how ball lightning forms, but the leading theories share a common thread: it originates from ordinary lightning strikes. One prominent model, published in Scientific Reports, proposes that a lightning bolt striking the ground produces a burst of high-energy electrons, which in turn generate intense microwave radiation. That radiation ionizes the surrounding air and pushes the resulting plasma outward, creating a spherical bubble that traps the microwaves inside. The trapped energy continuously re-ionizes the air shell, keeping the ball glowing for several seconds.
Laboratory experiments have produced ball lightning-like objects by firing electrical arcs into silicon. These artificial versions form buoyant, glowing spheres with densities close to that of the surrounding air, light enough to drift on a gentle breeze of just a few meters per second. The freely floating balls survived for fractions of a second to several seconds, consistent with what people report seeing in nature. Researchers believe the glow comes from a network of tiny silicon oxide particles that form as the molten material cools and oxidizes.
How Dangerous Is It Compared to Regular Lightning?
Regular lightning kills roughly 20 people per year in the United States and injures hundreds more. Ball lightning, by contrast, has a handful of documented injury cases across more than two centuries of records. The danger is real but statistically tiny. The main risks from ball lightning are burns (both thermal and electrical), loss of consciousness, and secondary hazards like fires ignited by the explosion when the ball dissipates.
What makes ball lightning uniquely unnerving is its behavior. Unlike a lightning bolt, which strikes in milliseconds, ball lightning lingers. It can drift horizontally, follow air currents, and enter buildings through chimneys, open doors, or even closed windows. You cannot predict its path, and there is no way to deflect or ground it the way a lightning rod handles a conventional strike.
What to Do If You See It
No agency publishes safety guidelines specific to ball lightning because encounters are too rare to study systematically. The best available advice comes from general thunderstorm safety, since ball lightning forms during or immediately after electrical storms. NOAA recommends moving into a large enclosed building with plumbing and electrical wiring, or into an enclosed metal-topped vehicle with the windows up. Stay inside for at least 30 minutes after the last sound of thunder.
If you see a glowing sphere drifting nearby, don’t touch it or approach it. Move away calmly and put distance between yourself and the object. Avoid standing near metal objects, plumbing, or electrical equipment, all of which could conduct energy if the ball discharges. Given that ball lightning has entered homes through chimneys and windows, staying in a central room away from openings offers a small additional margin of safety during a severe thunderstorm.
The practical takeaway: ball lightning is genuinely capable of causing serious injury, but your odds of encountering it are vanishingly small. The far greater threat during any thunderstorm is a conventional lightning strike, and the safety measures for that cover ball lightning as well as anything can.