OK, I've seen this strange thing in the sky sometimes. Not all that often, but sometimes. It actually happened tonight.
On most nights, at say 9 P.M. it is dark. There might be stars, moon, etc., but the sky itself is dark. Sometimes it's overcast and you can detect the clouds, and it might be a little brighter, but it is still dark.
Tonight is one of those other nights. It is heavily overcast, and the clouds are reflecting something from somewhere, because it is really bright out. I could easily read a book in this light. I did take the time to look around a bit at this time, and to the North of me, it did seem to be darker, so it's a quasi-local phenomena.
All I can think of is that somehow some kind of city lights (from a different city...) are getting reflected in the clouds, or more likely, the clouds are at such a height that they are still catching some kind of sunlight, even though the sun set some time ago.
What is this? It has to be a known phenomenon. I didn't see the moon, per se (which is about half full tonight) so could that be it? It seems unlikely.
I'd like to know what this is.