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The polar air advance in a week is still in the models, but only in a very weakened form. It will clear away the persistent fog and high fog that has built up up to now and make things more pleasant with wind and, shortly afterwards, drier air, before the next inversion begins - but nowhere near as mild as it is now. These current high pressure areas are very distinctive. In which years has something similar happened before and what followed? And what could follow this December?