1. Cirrocumulus clouds form in sheets or patches and do not cast shadows. 2. In extremely cold temperatures above the Arctic, more polar stratospheric clouds form . 3. As the visitors depart, a small but angry cloud forms overhead. 4. Clouds form when water vapor turns back into liquid water droplets.5. In suitable conditions, the characteristic " pennant " cloud forms downwind. 6. These wavy, bluish-white clouds form at rarefied altitudes near 50 miles. 7. If the air is cooled enough, condensation occurs and clouds form . 8. At a sufficiently low temperature, water clouds form , which further increase optical albedo. 9. Cirrus clouds form on other planets, including Mars, Jupiter, Saturn, Uranus, and possibly Neptune. 10. Fog and clouds form through condensation around cloud condensation nuclei.
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