how long post-lightning
before thunder reaches ears?
how far can I see?


According to Elizabeth Palermo, the “Life’s Little Mysteries” contributor at, the answer to my question can be found using the following formula:

“Next time you’re stuck in a thunderstorm, try this easy way to calculate how far away you are from lightning strikes.

Just count the number of seconds that pass between a flash of lightning and the crack of thunder that follows it, then divide that number by five. The resulting number will tell you how many miles away you are from where lightning just struck.

Five seconds, for example, indicates the lightning struck 1 mile away, and a 10-second gap means the lightning was 2 miles away.”