Clouds marching past

The cold air outbreak that I wrote about a few days ago will hit the UK tomorrow (Sunday), with subzero temperatures as far south as London. Here’s a picture of the cold air on its way southwards, taken from Bergen today:


The tall clouds are “mild” Cumulonimbus clouds forming as the moist, warm air over the sea surface rises in the cold air from the Arctic. I remember seeing such clouds, albeit more vigorous ones, during the IPY-THORPEX polar low field campaign in Andøya in northern Norway in March 2008.


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