Incredible clouds over Norwich

A circular cloud formation was spotted over Norwich Market yesterday morning (Tuesday).

Chris Bell, from Weatherquest, based at the University of East Anglia, said the formation, seen at about 8.45am, was known as 'fallstreak holes'. The Cloud Appreciation Society stated: 'Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation particles. When a portion of the water does start to freeze it will set off a domino effect, causing the water vapour around it to freeze and fall to the earth as well. This leaves a large, often circular, hole in the cloud.'

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