Lightning Myths and Facts
Myth: If you're caught outside during a thunderstorm, you should crouch down to reduce your risk of being struck.
Fact: Crouching doesn't make you any safer outdoors. Run to a substantial building or hard topped vehicle. If you are too far to run to one of these options, you have no good alternative. You are NOT safe anywhere outdoors. See our safety page for tips that may slightly reduce your risk.
Myth: Lightning never strikes the same place twice.
Fact: Lightning often strikes the same place repeatedly, especially if it’s a tall, pointy, isolated object. The Empire State Building is hit nearly 100 times a year.
Myth: If it’s not raining or there aren’t clouds overhead, you’re safe from lightning.
Fact: Lightning often strikes more than three miles from the center of the thunderstorm, far outside the rain or thunderstorm cloud. “Bolts from the blue” can strike 10-15 miles from the thunderstorm.
Myth: Rubber tires on a car protect you from lightning by insulating you from the ground.
Fact: Most cars are safe from lightning, but it is the metal roof and metal sides that protect you, NOT the rubber tires. Remember, convertibles, motorcycles, bicycles, open-shelled outdoor recreational vehicles and cars with fiberglass shells offer no protection from lightning. When lightning strikes a vehicle, it goes through the metal frame into the ground. Don't lean on doors during a thunderstorm.
Myth: A lightning victim is electrified. If you touch them, you’ll be electrocuted.
Fact: The human body does not store electricity. It is perfectly safe to touch a lightning victim to give them first aid. This is the most chilling of lightning Myths. Imagine if someone died because people were afraid to give CPR!
Myth: If outside in a thunderstorm, you should seek shelter under a tree to stay dry.
Fact: Being underneath a tree is the second leading cause of lightning casualties. Better to get wet than fried!
Myth: If you are in a house, you are 100% safe from lightning.
Fact: A house is a safe place to be during a thunderstorm as long as you avoid anything that conducts electricity. This means staying off corded phones, electrical appliances, wires, TV cables, computers, plumbing, metal doors and windows. Windows are hazardous for two reasons: wind generated during a thunderstorm can blow objects into the window, breaking it and causing glass to shatter and second, in older homes, in rare instances, lightning can come in cracks in the sides of windows.
Myth: If thunderstorms threaten while you are outside playing a game, it is okay to finish it before seeking shelter.
Fact: Many lightning casualties occur because people do not seek shelter soon enough. No game is worth death or life-long injuries. Seek proper shelter immediately if you hear thunder. Adults are responsible for the safety of children.
Myth: Structures with metal, or metal on the body (jewelry, cell phones,Mp3 players, watches, etc), attract lightning.
Fact: Height, pointy shape, and isolation are the dominant factors controlling where a lightning bolt will strike. The presence of metal makes absolutely no difference on where lightning strikes. Mountains are made of stone but get struck by lightning many times a year. When lightning threatens, take proper protective action immediately by seeking a safe shelter – don’t waste time removing metal. While metal does not attract lightning, it does conduct it so stay away from metal fences, railing, bleachers, etc.
Myth: If trapped outside and lightning is about to strike, I should lie flat on the ground.
Fact: Lying flat increases your chance of being affected by potentially deadly ground current. If you are caught outside in a thunderstorm, you keep moving toward a safe shelter.
Myth: lightning flashes are 3-4
Fact: Old data said successive flashes were on the order of 3-4
km apart. New data shows half the flashes are about 9 km apart.
The National Severe Storms Laboratory report concludes: "It
appears the safety rules need to be modified to increase the
distance from a previous flash which can be considered to
be relatively safe, to at least 10 to 13 km (6 to 8 miles).
In the past, 3 to 5 km (2-3 miles) was as used in lightning
safety education." Source: Separation Between Successive Lightning Flashes
in Different Storms Systems: 1998, Lopez & Holle, from Proceedings
1998 Intl Lightning Detection Conference, Tucson AZ, November
Myth: A High Percentage of Lightning Flashes Are Forked.
Fact: Many cloud-to-ground lightning flashes have forked or multiple
attachment points to earth. Tests carried out in the US and
Japan verify this finding in at least half of negative flashes
and more than 70% of positive flashes. Many lightning detectors
cannot acquire accurate information about these multiple ground
lightning attachments. Source: Termination of Multiple Stroke Flashes Observed
by Electro- Magnetic Field: 1998, Ishii, et al. Proceedings
1998 Int'l Lightning Protection Conference, Birmingham UK,
Myth: Lightning Can Spread out Some 60 Feet After Striking Earth.
Fact: Radial horizontal arcing has been measured at least 20 m.
from the point where lightning hits ground. Depending on soils
characteristics, safe conditions for people and equipment
near lightning termination points (ground rods) may need to
be re-evaluated. Source: 1993 Triggered Lightning Test Program: Environments
Within 20 meters of the Lightning Channel and Small Are Temporary
Protection Concepts: 1993, SAND94-0311, Sandia Natl Lab, Albuquerque
- Cape Canaveral Air Force Station/Kennedy Space Center
has documented anvil lightning traveling 87.5 mph.
- How far can you see lightning? According to Cape Canaveral/Kennedy
Space Center, up to 100-km flashes.
- Lightning Causes Forest Fires. Can Forest Fires Cause
Lightning? Yes, smoke and carbon micro-particles, when introduced
into the upper atmosphere, can become the initiators of
static. Sufficient atmospheric static can spark discharge
as lightning. Reports of massive lightning storms in coastal
Brasil, Peru and Hawaii have been linked to burning of sugar
cane fields. The late 90's Mexican forest fires resulted
in unusual lightning activity in the USA High Plains area
(Lyons, et al.) So too can dust in an enclosed grain elevator
create a static discharge. Recent reports (Orville, et al)
show the Houston TX petrochemical industry, discharging
copious amounts of hydrocarbons into the upper atmosphere,
may be responsible for higher-than-normal lightning activity
in that area. (National Lightning Safety Institute)