Cloud metamorphosis

Over the course of an hour or so, this cloud was transformed, though it stayed in more or less the same place, from a streak to what looked like a sheet of snow in the sky, then cloudlets that gradually dispersed.

If you click on the first image, you'll see it enlarged and can go through the sequence.

Faint and far away

Cirrocumulus stratiformis, very high and formed of ice crystals and super-cooled water droplets, forming a ripple pattern. The smudgy larger clouds on the right are lower altocumulus.