When the radio said in the morning that the lads can't see even their hands due to the thick mist, I didn't immediately know what they were talking about - this part of town had mild fog and low on the street level - I didn't see anything from my window.
As I looked out from the client's windows on the 8th floor, this was all I saw. Traffic, towers, shopping malls, the forest and park around the lake, and even the lake - all gone.
I imagine this is what the dwarves saw when they were entering Mirkwood [The Hobbit].
Later, driving home, the mist is has circled around me and is approaching me from the front, eating everything. A large puffy cloud that I am driving into.