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High clouds

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.

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High clouds

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  1. 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

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

  3. “mackerel sky”

  4. cirrocumulus

  5. Cirrostratus • Broad 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

  6. cirrostratus

  7. halo

  8. Middle Clouds • 6500-20,000 ft. • alto- • ice crystals and water droplets

  9. Altocumulus • can be parallel bands or rounded masses; can distinguish from cirrocumulus because part of them is usually shaded • form by convection in an unstable layer aloft • may suggest an approaching cold front • Hold hand at arm’s length, clouds are thumbnail size

  10. altocumulus

  11. Altocumulus

  12. altocumulus

  13. Altostratus • Absence of shadows • Sun or moon is bright spot behind clouds, no halo

  14. Low Clouds • <6500 ft. • strat- • water droplets

  15. nimbostratus

  16. stratocumulus • Low, lumpy layer of rounded masses, rolls, sometimes with clear sky between • Hold hand at arm’s length, clouds are fist-size

  17. Cumulonimbusvertically developed

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