You want my secret!?!?!?!?!?!?!?!?!? How will I possibly sell all my beautiful sunsets with you in the game?

Oh, that's right, I shoot B/W, and don't compete on that level, or any other apparently.

So, here's the deal. Atmospheric aerosol pollutants (i.e., volcanic dust, forest fire smoke, etc.) will assist greatly with scattering of longer wavelengths (i.e., reds), when present. The best sunsets can be predicted (but not fool–p(r)oof) when a layer of cirrus or stratoform clouds are "over" the sky of the setting or rising sun – which will be where you aren't – and interesting clouds of any kind are present from the direction of the horizon to your location to reflect the colored light. This situation arises prior to or upon clearing of "storms", at least in the mid–latitudes, as others have indicated.

Caveat: I don't play a "weatherman" on TV, I'm only an atmospheric scientist.