September update to @metoffice GloSea5 for DJF 2020-21 shows an ensemble-mean signal for +AO/+NAO. This is not quite as strong as the same forecast from last year, when GloSea sniffed out the extreme winter with the best lead time (see our preprint: https://t.co/2GxoHcVklr) pic.twitter.com/bOe7iufBzm

— Dr Simon Lee (@SimonLeeWx) September 11, 2020