You know what you do? When you see the lightning you count till you hear the thunder. If you can count higher each time that means the storm's moving away from us.
14 seconds sound clip from the Poltergeist (1982) movie soundboard.
You can hear this line at 00:19:34 in the Blu-ray version of the movie.
Quote context
[...]
- It looks at me. It knows I live here.
- I think the storm's gonna pass us.
- Wow.
[...]