To me, if something is in the air it has to do with thoughts.
Thoughts can make you feel happy or sad. Angry, elated or depressed.
Can't recall exactly what I was doing around this time.
Think I was reading about HARP and experiments to affect the weather. There was hurricane Sandy. Also the election was coming up and there were a lot of conflicting thoughts about that too.
The thing that struck me about these clouds was that they moved like a flock of birds or swarm of insects.
Probably a mixture of all of the above. Only time I feel down is at work, and that lessens as the time ticks on and I get to come home. :)