Sunday, 9 December 2012

Nacreous Cloud over the Broch

This extraordinary, bright cloud formation  appeared over Fraserburgh yesterday  afternoon at around 16:15, just as the last of the light was fading. It persisted for about 15 minutes before being obscured by dark clouds. According to  a report in the Press and Journal for Monday 10th December the cloud could be seen from across Aberdeen and Aberdeenshire having formed at very low temperatures -85c high in the stratosphere.

This extraordinary and beautiful cloud has been identified as a nacreous cloud and despite the beautiful, rainbow colours it contains, it is not good news.The cloud consists of greenhouse gasses,  formed by excess methane released into the atmosphere reacting with the ozone to form chlorine clouds. The cloud reflects sunlight from below the horizon and so appears to shine brightest just after dusk. Such clouds are normally seen only in polar countries, global warming being responsible for them appearing over Scotland.

Similar clouds have been known to prompt reports of UFOs

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