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Page last updated at 07:22 GMT, Monday, 1 June 2009 08:22 UK

Introducing the asperatus cloud

The Cloud Appreciation Society claims to have discovered a new type of cloud for the first time in 50 years. They are calling for the asperatus to join the cirrus, altostratus, stratocumulus and cumulus. Gavin Pretor-Pinney, founder of the cloud appreciation society, and veteran weatherman Michael Fish discuss the new classification.

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