At what minimum cloud temperatures do crystals usually form?

• At -4oC or warmer

  • Ice formation is almost impossible without seeding from above.

• At -9oC

  • The majority of clouds (over 50%) will be all supercooled water providing there is no cloud seeding from above

• At -14oC

  • about 75% off all clouds will contain some ice

• At -18oC or colder

  • almost all clouds have ice nuceii

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