Thunder and Lightning!
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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