Yesterday morning (04.11.2014) I woke up at 6:40 as usual and noticed that it was relatively bright out. I had a better look around 7 and concluded that it was definitely quite a bit brighter than it was the day before at that time. There was also a strange, yellow tint to the light.
I looked up when the sun comes up in Basel (where I live) and found out it's at 7:18. Later I did some googling to see if anyone else had noticed this and came across this article about something similar happening in 2008. It mentions polar stratospheric clouds as a likely cause. The following evening however, I didn't notice anything remarkable. And as I write this the next morning, The sun has now been up for an hour but due to clouds it looks darker than it did an hour and a half earlier in the morning yesterday.
So I'm wondering, what is the cause of this unusually bright morning twilight? And can I expect to see it again in the coming days/weeks/months?
Something that might relate to this is the siberian winter that seems to await Europe.
PS: I also wouldn't be averse to other people around Europe confirming that they also noticed this.