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Sunday, 27 November 2011

November 2011 - Why so warm?

This has been one of the warmest Novembers on record – but why?

The transfer of heat energy from the tropics to the poles drives our weather in the UK. This transfer occurs via the jet stream. However, this year the jet stream has been diverted either side of the UK. As a result, negative vorticity – clockwise rotation of winds in the upper atmosphere, has meant that air is descending through our atmosphere, drying out and leading to the air warming as it descends. Consequently, temperatures have been around 3 degrees above the average for the time of year.

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