high clouds

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High clouds. >23,000 ft. cirr- (curl of hair) ice crystals generally occur in fair weather and point in direction of air movement at their elevation. Cirrocumulus : clouds in long rows of puffy clouds; often precursor to precipitation. mackerel sky. cirrocumulus. Cirrostratus. - PowerPoint PPT Presentation

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High clouds>23,000 ft.cirr- (curl of hair)ice crystalsgenerally occur in fair weather and point in direction of air movement at their elevation

Cirrocumulus: clouds in long rows of puffy clouds; often precursor to precipitation

mackerel sky

cirrocumulus

CirrostratusBroad layer of air lifted by large scale convergence; transparent enough to see sun or moon

halo may form from refraction of light by ice crystals

will thicken and lower if warm front is approaching

cirrostratus

halo

Middle Clouds6500-20,000 ft.alto-ice crystals and water dropletsAltocumuluscan be parallel bands or rounded masses; can distinguish from cirrocumulus because part of them is usually shadedform by convection in an unstable layer aloftmay suggest an approaching cold frontHold hand at arms length, clouds are thumbnail size

altocumulus

Altocumulus

altocumulus

AltostratusAbsence of shadows

Sun or moon is bright spot behind clouds, no halo

Low Clouds

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