I remember reading a couple of years ago about pink snow in Siberia/Russia. Maybe the algae/bacteria can also become airborne by evaporation into the clouds. I would think the bacterial environment would have to be a warm one, but with all the new toxins, pollutants, genetic modifications of seeds, chemtrails, Cell Phone EMF, solar/magnetic fluctuations, etc. nature is in a state of chaos these days.
The media always seemed to avoid things they can't explain, but this is way too much silence (these days, they largely report only gossip and hype, the dumbing down of America).