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Thunderstorms can turn an ordinary day into a potentially dangerous situation within minutes. Lightning, powerful winds, heavy rain, and sudden flooding are all hazards worth taking seriously. But one familiar piece of advice often catches people by surprise: avoid showering, bathing, or washing dishes while lightning is occurring nearby.
This recommendation is not simply an old household myth. The underlying concern is that lightning can travel through a building’s plumbing and electrical systems, creating a potential pathway for injury.
Why Can Plumbing Be Dangerous?
Lightning is an enormous electrical discharge. If a strike hits a home, plumbing system, or nearby utility infrastructure, electrical energy can potentially travel through conductive materials.
Metal plumbing can provide a pathway for electrical current, while water containing dissolved minerals can also conduct electricity. For that reason, the National Weather Service advises people to avoid contact with plumbing and running water during thunderstorms.
That means activities such as taking a shower, filling a bathtub, or washing dishes are better postponed until the storm has passed.
Why the Shower Is a Particular Concern
A person standing in a shower is in direct contact with running water and plumbing fixtures. In some homes, shower systems can also include metal components, creating additional conductive materials.
The risk is not limited to older houses with extensive metal plumbing. Modern buildings can contain a mixture of materials, and it is difficult for an ordinary homeowner to determine exactly how electrical energy might travel during a lightning event.
Because the consequences of a lightning strike can be severe, safety authorities recommend avoiding unnecessary contact with plumbing rather than trying to determine whether a particular shower system is safe.s
What Does a Storm Warning Actually Mean?
Weather warnings are based on observations, forecasts, radar data, and other information collected by meteorologists.
The National Weather Service distinguishes between a watch and a warning. A watch means conditions are favorable for a hazardous event, while a warning indicates that hazardous weather is occurring, imminent, or has a high probability of occurring and that people in the affected area should take action.
For severe thunderstorms, meteorologists monitor conditions such as atmospheric instability, moisture, and lifting mechanisms that allow thunderstorms to develop. Radar and reports from trained observers can then help identify storms capable of producing dangerous weather.
How Long Should You Wait?
A practical rule is to wait until the thunderstorm has clearly moved away before returning to activities involving plumbing.
The National Weather Service’s lightning safety guidance follows the broader principle of waiting until the threat has passed rather than assuming that a brief pause in rain means the danger is over. Thunder can be heard from considerable distances, so hearing thunder means lightning may still pose a risk.
When a storm is nearby, it is better to postpone a shower for a little while than to take an unnecessary chance.
Other Indoor Precautions Matter Too
Staying indoors during a thunderstorm is an important first step, but being inside does not mean every activity is risk-free.
Experts recommend avoiding contact with electrical equipment connected to outlets and avoiding plumbing during lightning activity. Corded telephones and wired electrical systems can potentially provide pathways for electrical current.
You should also stay away from windows and doors during severe storms, particularly when strong winds, hail, or tornadoes are possible.
Technology Is Improving Storm Warnings
Weather forecasting has become increasingly sophisticated. NOAA researchers are developing systems that combine radar, satellite observations, and high-resolution computer models to improve the timing and accuracy of severe-weather warnings.
The experimental Warn-on-Forecast system, for example, uses frequently updated observations and ensemble modeling to provide increasingly detailed information about developing thunderstorms and their hazards.
These advances can give communities more useful information, but individual safety decisions still matter.