A few days after a light snowfall of less than 50 mm, I observed that the snow on the surface of ice transformed into filaments. Sublimation in dry air at the low air temperature of -15 C may have contributed to the formation of such snow structure from nucleation points.
Here are ice filaments formed above a stream.
Here are ice filaments formed on the surface of a garbage bin, captured by my geological engineer/exploration geologist daughter Évelyne.
