Mammatus clouds only occur in the vicinity of severe thunderstorms and supercells.

They are named after 'mammaries' because of their peculiar 'mammary'-like appearance.

All these photos were taken in the vicinity of Hobart, Oklahoma, on 24th May 2002 just after the passage of a supercell thunderstorm.

To see the storm chase photos, look in the 'Storm Chasing' album.

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Mammatus Sky
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