Cirrus uncinus (Ci unc), popularly known as mares' tails, is a species of thin cirrus cloud which has a fibrous and hooked appearance. It forms at very high altitudes in unstable layers of the troposphere, usually at temperatures of approximately negative 50 degrees Celsius. Often, they herald the approach of a frontal system and possibly precipitation. When wind shear is positive (higher windspeeds at higher altitudes), the hook curves downward, whereas it curves upward when wind shear is negative.
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| - Cirrus uncinus (Ci unc), popularly known as mares' tails, is a species of thin cirrus cloud which has a fibrous and hooked appearance. It forms at very high altitudes in unstable layers of the troposphere, usually at temperatures of approximately negative 50 degrees Celsius. Often, they herald the approach of a frontal system and possibly precipitation. When wind shear is positive (higher windspeeds at higher altitudes), the hook curves downward, whereas it curves upward when wind shear is negative.
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| - Cirrus uncinus (Ci unc), popularly known as mares' tails, is a species of thin cirrus cloud which has a fibrous and hooked appearance. It forms at very high altitudes in unstable layers of the troposphere, usually at temperatures of approximately negative 50 degrees Celsius. Often, they herald the approach of a frontal system and possibly precipitation. When wind shear is positive (higher windspeeds at higher altitudes), the hook curves downward, whereas it curves upward when wind shear is negative.
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