What is a Power Flash?

A power flash is a sudden burst of bright light caused by electrical arcing when power lines, transformers, or other electrical equipment are damaged during severe weather. Unlike lightning, which originates in the sky, power flashes occur near the ground when high winds, tornadoes, or falling debris disrupt electrical systems.

Power flashes are often seen during tornadoes and severe thunderstorms when intense winds snap power lines or topple utility poles. These flashes can help storm spotters and meteorologists identify tornadoes at night or in low-visibility conditions when a funnel cloud might not be visible.

Because power flashes indicate electrical system failures, they often lead to localized power outages. In areas prone to severe weather, underground power lines can reduce the risk of power flashes and improve grid reliability during storms.