The reasons for the mild December

If you want to know the reason why Moscow was so mild during December 2019 then look no further than the mean surface pressure chart for the month and you’ll see a straight W’SW flow from 60° west right across to 50° east. That’s because pressure was over 10 hPa low to the northwest of Scotland during the month and around 3 hPa higher close to the Azores, between them this tightened the W’SW flow across the Atlantic, especially between latitudes 45 and 55° north, and that’s why the UK was around 1 or 2°C milder than average and much wetter especially in the northwest at the beginning of the month. Interestingly the pressure anomalies across much of Greenland again managed to remain positive.

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