The simplest rule for thunderstorm safety comes from the National Weather Service: when thunder roars, go indoors. If you can hear thunder, you’re within striking distance of lightning, and you should stay inside for 30 minutes after the last clap. Between 2006 and 2021, lightning killed 444 people in the United States, and almost two-thirds of those deaths happened during leisure activities like fishing, boating, playing sports, and spending time at the beach. Most lightning deaths are preventable with a few straightforward precautions.
What Counts as Safe Shelter
Not every structure protects you from lightning. A safe building has walls, a roof, plumbing, and wiring. These elements give lightning a path to the ground that doesn’t pass through you. A substantial house, office building, school, or shopping center all qualify.
Open structures do not. Picnic pavilions, bus shelters, dugouts, sheds, tents, and covered porches leave you exposed. They have no walls or internal wiring to channel a strike safely. If the only nearby option is one of these, you’re better off in a vehicle.
A hard-topped car, truck, or van is your second-best option. The metal shell acts as a cage that routes electrical current around the outside and into the ground. Keep the windows rolled up and avoid touching metal surfaces inside. Convertibles, soft-top Jeeps, and vehicles with fiberglass bodies do not offer this protection.
What to Avoid While Indoors
Being inside a solid building doesn’t mean every activity is safe. Lightning can travel through a building’s plumbing, electrical wiring, and any metal reinforcement in concrete. The CDC recommends avoiding all water contact during a thunderstorm: no showers, baths, dishwashing, or handwashing. Plastic pipes reduce the risk somewhat compared to metal, but the safest approach is to stay away from all plumbing until the storm passes.
Anything plugged into a wall outlet is a potential path for a lightning surge. That includes computers, gaming consoles, washers, dryers, and stoves. Corded phones are particularly dangerous and should not be used at all during a storm. Cell phones and cordless phones are fine because they aren’t physically connected to the wiring in your walls.
Concrete floors and walls can also conduct lightning through the metal rebar embedded inside them. Avoid lying on a concrete garage floor or leaning against a concrete basement wall during an active storm.
Protecting Your Electronics and Home
A direct lightning strike delivers roughly 5 billion joules of energy. A typical surge protector power strip handles about 2,000 joules, making it effectively useless against a direct hit. Surge protectors are designed for smaller power fluctuations, not for the catastrophic voltage spike of a lightning bolt.
Lightning rods work on a completely different principle. Mounted at high points on a roof and connected by cable to a grounding system, they give lightning a preferred path directly into the earth, preventing the strike from passing through your home’s structure and wiring. If you live in a lightning-prone area, a professionally installed lightning rod system paired with a whole-house surge protector offers the most reliable defense. The rod diverts the strike; the whole-house protector, installed at your electrical panel, handles residual surges before they reach your devices.
The simplest precaution costs nothing: unplug valuable electronics before the storm arrives.
If You’re Caught Outside
There is no safe position outdoors during a thunderstorm. The National Weather Service stopped recommending the “lightning crouch” in 2008 because it doesn’t provide meaningful protection. Whether you’re standing, crouching, or lying flat, a lightning channel approaching from overhead will likely strike you regardless. Promoting the crouch gave people a false sense of security that sometimes delayed their decision to seek real shelter.
If you genuinely cannot reach a building or vehicle, you can still reduce your risk by avoiding the most dangerous situations:
- Stay out of open areas. Fields, golf courses, and parking lots leave you as the tallest object around.
- Move away from tall, isolated objects. A single tree in a field is one of the worst places to stand. In a wooded area, move to a lower section and put as much distance as possible between yourself and any individual tree.
- Get off the water immediately. Fishing and boating account for a large share of lightning fatalities. If you’re on a lake or ocean, head to shore at the first sign of a storm.
- Spread out in groups. If multiple people are caught outside together, separating increases the chance that uninjured members can help anyone who is struck.
What Lightning Does to the Body
Lightning primarily damages the nervous system and the heart. The most common cause of death from a lightning strike is cardiac arrest triggered by a disruption in the heart’s electrical rhythm. Survivors frequently experience loss of consciousness, confusion, and amnesia in the immediate aftermath.
A condition sometimes called “lightning paralysis” can cause temporary loss of movement and sensation in the arms or legs, along with cold, mottled skin and absent pulses. This results from damage to the part of the nervous system that controls involuntary functions like blood flow, and it typically resolves within hours, though not always completely.
Long-term effects are common among survivors. Cognitive difficulties, chronic pain, sleep disturbances, attention problems, and memory issues can persist for months or years. Cataracts can develop within days of a strike. Ruptured eardrums are another frequent injury. The branching, fern-like skin marks sometimes seen on strike victims (called Lichtenberg figures) are distinctive but usually superficial.
Lightning strike victims are safe to touch immediately. They carry no residual electrical charge. If someone near you is struck and unresponsive, calling emergency services and starting CPR can be the difference between survival and death, since cardiac arrest is the primary killer.
Keeping Pets and Livestock Safe
Dog houses, chicken coops, and open-sided lean-tos do not protect animals from lightning any more than they protect people. If a storm is approaching, bring pets indoors. Dogs chained outside or left in metal kennels are at particular risk.
For livestock, the best protection is a sturdy, enclosed barn or shelter built on high ground to avoid flooding. The USDA recommends ensuring these structures can withstand high winds and heavy rain, and that each animal has roughly four times its body size in floor space. Stock the shelter with enough food and water to sustain animals for at least a day in case the storm prevents you from reaching them. Fencing animals away from isolated trees and bodies of water during storm season also reduces their exposure to strikes.
Timing Your Safety
Work-related activities account for about 18% of lightning deaths, with farmers and ranchers facing the highest occupational risk. But the majority of fatalities happen during recreational time, when people are slower to abandon an activity they’re enjoying. The 30-minute rule exists because lightning can strike miles from the center of a storm. Storms that seem to be moving away can still produce dangerous bolts nearby, and new cells can develop without warning. Waiting a full 30 minutes after the last thunder before going back outside is the single most effective habit you can build.