Even Indoors, Lightning is Still a Risk

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Published Sunday, June 18, 2017
by National Weather Service - Pueblo Staff

Colorado Lightning Safety Awareness Week continues through Saturday. Today we discuss indoor lightning safety.

Statistics tell us that we are much less likely to become a lightning strike victim if we are inside a substantial structure such as a home or office building. In 2016, thirty-eight people in the United States were killed by lightning, and these fatalities occurred outdoors. While nearly all people who are injured or killed by lightning were outdoors, a small percentage of people are injured by lightning while indoors. Therefore, it is important to discuss lightning safety while indoors.

The dangerous electrical current associated with a lightning strike typically enters a structure through wires, cables or pipes that connect to the building from the outside. Lightning can also directly enter a structure through an open window, door or garage door. Once in a structure, the dangerous current can travel through the electrical, phone, cable and plumbing systems and through metal wires or bars in concrete walls or flooring.

Corded electronic devices are the leading cause of indoor lightning injuries in the United States. These include personal computer keyboards, game consoles, and corded phones. Other injuries have occurred when people were close by to televisions which connect to an outside cable or satellite system. Open windows, doors and garage doors allow for a direct strike to enter a home, so make sure all windows and doors are closed when lightning is occurring. Never watch a lightning storm from a porch or open garage door. There are several You-Tube videos that show people being injured by lightning while they were recording lightning from their porch or open garage door.

It is very important to stay away from any plumbing when lightning is occurring outside. This includes sinks, bathtubs and showers. When lightning is occurring, do not hand wash dishes, do not give kids a bath, and do not take a shower. It is best to wait to do laundry until after the storm goes by as washers and dryers are connected to both the electrical and plumbing systems.

People have also been injured while leaning and standing near concrete in their homes and offices. This is due to metal rebar which is in the concrete, and this metal acts as a conductor when lightning hits the building.

A house or other substantial building offers the best protection from lightning. In contrast, many small shelters such as bullpens, picnic shelters, sheds or tents (no matter what the size) offer no protection from lightning, and should be avoided at all cost.

Here is a summary of lightning safety tips for inside the home: 1. Avoid corded electronics and electrical equipment.

2. Avoid contact with plumbing, such as taking a shower, bathing, hand washing dishes or doing laundry.
3. Stay away from windows, doors, garages and porches.
4. Do not lie on concrete floors or lean against concrete walls.

5. If a substantial building is not nearby, an enclosed car or truck offers excellent protection from lightning.

Here are a couple of web sites that contain additional lightning information:

The lightning topic for tomorrow will be lightning medical issues for survivors.