Weather, Geography, or both?

The lightening flashes outside, lighting up the afternoon sky.


I start counting, first in my head, and then out loud, "... 4-mississippi... 5-mississippi.... 6-mississippi...:


The thunder rumbles in answer.


Dale: Why did you do that?


Me: You can count how long it takes to hear thunder after the lightening and know how far away it was."


Dale: So.... the lightening was in Mississippi?