Lightning kills more people each year than tornadoes and hurricanes COMBINED. Thunder is the sound wave that occurs when air expands rapidly due to the extreme heat of a lightning flash.

One way to estimate thunderstorm distance involves counting the seconds between a flash of lightning and the clap of thunder. Divide the number you get by 5 to estimate the distance (in miles) to the thunderstorm. Be sure to take cover if the storm is getting closer.

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