[Iscool]

If the wind is in the right direction, we hear a train that is about nine miles away.

Barometric pressure...

When the pressure is low, (potential rain), it's like a lid was put on the atmosphere and pressed down...Everything goes sideways instead of up, including sound, and smoke...

[hoosierham]

Exactly.

When I can hear the trains on the tracks miles away it means rain soon.Train sounds not heard here in clear weather.