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Fine curved streaks marking high ice cloud.
Also known as: High cloud symbol, Mares tails
Cirrus is drawn as fine hooked streaks. It is made of ice crystals rather than droplets, and its hooks are falling crystals sheared by wind at a different speed, which is why the shape says something about the wind above.
Denotes cirrus: high cloud composed of ice crystals, drawn as fine detached filaments.
Contexts: Navigation, Maps
Takes its hooked form from ice crystals falling into air moving at a different speed, so the shape records wind shear at height.
Contexts: Navigation, Maps
Two or three fine curved strokes with hooked ends, drawn detached from one another.