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Home Learning Library and Archive Learn more about the weather Cloud types for observers C_M guide C_M2 Thick As or Ns

C_M2 Thick altostratus or nimbostratus

Pannus clouds, generally moving fast and changing shape rapidly, frequently occur beneath the base of nimbostratus.

Nimbostratus with pannus, base 800 ft below. © R.K. Pilsbury

Related pages: Cloud classification | C_L guide | C_M guide | C_H guide | Cloud index