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9. When Altostratus clouds are present, what color is the sky? 10. True or False: Cumulonimbus clouds produce thunderstorms. 11. What time of year do cumulonimbus clouds form? 12. What clouds are created from stratus or altostratus clouds? 13. True or False: Nimbostratus clouds don't produce powerful storms with hail or lightening. 14. Why are cirrocumulous clouds also called "mackerel sky"? 15. The transition from cirrus to cirrostratus clouds is often a sign that a front is passing through meaning rain or snow in the next 24 hours. 16. Describe cirrus clouds. 17. True or False: Any precipitation that falls from cirrus will evaporate before it hits the ground