Lenticular clouds
Media playback is unsupported on your device

Rare cloud formation is photographed in West Yorkshire

23 December 2011 Last updated at 09:33 GMT

Rare lenticular clouds which are mostly seen near large mountainous areas such as the Himalayas and Rocky Mountains were photographed by local people across West Yorkshire on 22 December.

BBC weather broadcaster Carol Kirkwood explains how the phenomenon occurs.