Storm Safety 2020: Lightning

A spark of creativity — good. A spark of lightning — bad. A quick quiz and video of a man hit by lightning while walking his dogs, in today’s Severe Weather Awareness Week post.

(photo credit: Steve Boleski. Taken near Dillwyn, KS May 8, 2019)

So far in this series: Preparedness | Tornadoes    Still to come: Wind & Hail | Flooding

How much do you know about lightning?

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The 30-30 rule, which stated that you should go inside if you see lightning and the thunder arrives within 30 seconds, has been replaced by "When Thunder Roars, Go Indoors". Lightning has been recorded as far as 20 miles in advance of a storm! The advice to stay inside until 30 minutes after the last thunder is still good. 

If you can hear the thunder, the lightning is close enough to be a danger to you.

Photo (c) Steve Boleski, 2019. Taken near Fowler, KS.

Lightning is a giant spark of electricity in the atmosphere or between the atmosphere and the ground. In the initial stages of development, air acts as an insulator between the positive and negative charges in the cloud and between the cloud and the ground; however, when the differences in charges becomes too great, this insulating capacity of the air breaks down and there is a rapid discharge of electricity that we know as lightning. 

A typical lightning flash is about 300 million Volts and about 30,000 Amps. In comparison, household current is 120 Volts and 15 Amps. There is enough energy in a typical flash of lightning to light a 100-watt incandescent light bulb for about three months or the equivalent compact fluorescent bulb for about a year.

Lightning strikes the United States about 25 million times a year. In Kansas alone, there are on average 1 million lightning strikes a year (source). Although most lightning occurs in the summer, people can be struck at any time of year. Lightning kills an average of 47 people in the United States each year, and hundreds more are severely injured. (source: NWS)

Lightning Myths and Facts

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. 

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.

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!

Fact: A house or business 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.

(source: NWS)

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