Then I noticed an intriguing sight:
What are those lines? They look like clouds more than smoke to me. Were they made by a plane? Well there was the first question that popped into my head. There were two planes in the sky at that moment, and you can see one that I have circled in pink (pardon my shaky hands, that was the best circle I could do). It is kinda tiny compared to those lines, so it must have been one gigantic plane/ spaceship (X-files mystery!)/ bird that created those?? A while later, this was what I saw:

More lines, with no sight nor sound of any planes. The lines in the first photo are now at the right-hand corner. If it was not so cold today (5oC again!), I would have stood on the streets to get better photos and figure it out.
Someone tell me please, what are those, who made them and how? Could those be clouds, and if so why are they shaped as such! I do not recall ever learning that in sciences class before. Ooo.. did I stumble upon a novel type of clouds?!