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Optical Effects
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Mammatus (Mamma) and subtle signs of asperitas spotted over Kamloops, British Columbia, Canada
Pannus beneath a storm system, spotted over Los Alamos, New Mexico, US
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Cumulonimbus with signs of mammatus (mamma) and pannus, spotted over Bigfork, Montana, US
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Mammatus (Mamma) spotted at sunset over Mercogliano, Italy
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Mammatus (Mamma) spotted over Sourton Down, Okehampton, England
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Mammatus (Mamma) that preceded rainfall over Daventry, Northamptonshire, England
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A storm system near Port Bourgenay, La Vendée, France
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Signs of mammatus (mamma) spotted at dawn over Reigate, England
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Notable mammatus (mamma) within a storm system over Bluff, Utah, US
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Mammatus (Mamma) spotted over North Gloucestershire, England
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A tumultuous sky over Venice, Italy
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An expansive display of mammatus (mamma) spotted by Sally Grace Mindrebo, over Albuquerque, New Mexico, US
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A storm system captured at sunset, near Los Alamos, New Mexico, US
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A vivid rainbow accompanied by mammatus (mamma), spotted from the National Center for Atmospheric Research’s (NCAR) Mesa Laboratory, near Boulder, Colorado, US
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Mammatus (Mamma) spotted during a storm over Stoke Newington, London, England
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Asperitas and mammatus (mamma) ahead of a storm system, on one of Helen's best cloud spotting days, near Wells, Somerset, England
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