04/22/2026
How Far Away Is The Lightning?
If you see lightning, there is a way to estimate out how far away it is. This method is called the flash to bang method. When you see a flash of lightening start counting until you hear the thunder. Now divide that number by 5 and that is an estimate of how many miles away the lightning is from you.
However, several factors make it an estimate rather than an exact measurement:
Air temperature and humidity affect the speed of sound — warmer air speeds it up, colder air slows it down.
Terrain and echoes can distort the timing if sound reflects off hills or buildings.
Despite these limitations, it’s accurate enough for safety decisions: if thunder follows lightning within 30 seconds (≈ 6 miles), experts advise moving indoors immediately, since lightning can strike well beyond the visible rain area.
Stay safe!