- Mares’ tails Cirrus clouds etch the sky with delicate ice-crystal trails
- W030735Z
- Mares’ tails Cirrus clouds etch the blue sky with delicate white ice-crystal trails. The crystals fall straight down initially but then curve back and level out. This shows that the wind is nearly uniform below the tops, then decreases rapidly to a much slower speed, causing the trail to settle horizontally. Tiny new tufts are interspersed with the four longest, older elements.
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