Hi Bwheeler,
I get that kind of stuff. To me, it's like smelling things coming from upwind, you know? It's just a sense of what's to come. It's like an echo of a sound, except it occurs before the sound, if that makes any sense. For me, I just say it's "one of those things" and leave it at that. There's no point in analyzing it because no one else will see the same way you do. Just get to know your way unique way of seeing. That way it can be helpful.
Hope that helps.
Orca