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Mammatus Clouds

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Image credits: HeavyLight.ca

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Image credits: Ken Lewis –

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Image credits: Vincent Fryhover

Lenticular Clouds

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Image credits: Brian Middleton

Image credits: Jean-Michel Priaux

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Image credits: Dementievskiy Ivan

Undulatus Asperatus

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Image credits: JΩSH

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Image credits: wittap

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Image credits: JΩSH

Fallstreak Hole

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Image credits: ladigue_99

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Image credits: mtnrockdhh

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Image credits: lookseenseen

Polar Stratospheric Cloud

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Image credits: Alan R. Light

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Image credits: FotoLind

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Image credits: FotoLind

Cirrus Kelvin-Helmholtz

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Image credits: drdouglascordeiro.blogspot.com

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Image credits: drdouglascordeiro.blogspot.com

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Image credits: pfjc&pfjc2

Roll Clouds

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Image credits: Kick Petroff

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Image credits: apod.nasa.gov

Anvil Clouds

Image credits: Nicholas_T

Image credits: hide

Image credits: *Lampy*

Also, check out Smeared Sky Photography by Matt Molloy

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