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Feeling their hair stand on end is a key sign of an imminent lightning strike, particularly for Qualified Electrical Workers who need to recognize the dangers associated with electrical storms. This phenomenon occurs due to the buildup of electrical charge in the atmosphere before a lightning strike. As the electrical field intensifies, it can cause individual strands of hair to become charged and stand up, indicating a strong electrical field, which suggests that a lightning strike may occur very soon.

This instinctive reaction serves as a physical warning, alerting individuals to the presence of significant electrical activity nearby, at which point they need to seek shelter immediately. The other signs mentioned can be indicators of a storm, but they do not specifically signify the dangerous condition that leads up to a lightning strike as clearly as the sensation of hair standing on end does.