Already in seasonal forecasts for Autumn 2020 and Winter 2020/2021 Mkweather described changing climate patterns during autumn and early winter period, linked with melting Arctic, Global Warming hole, Gulf Stream and Icelandic stormtrack shifting /https://mkweather.com/2020/09/29/gulf-stream-the-weakest-for-1600-years-northern-ireland-with-the-coldest-recorded-september-temperature-in-history//.
Seasonal forecast for Autumn 2020: https://mkweather.com/2020/08/22/europe-autumn-2020-forecast-mkweather-accuweather-maps-and-analysis/
First forecast for Winter 2020/2021: https://mkweather.com/2020/07/29/first-forecast-for-winter-2020-21-early-powerful-coldwaves-nov-dec-then-weakening-of-cold-pattern-and-warm-jan-feb-mar/
Updated forecast for Winter 2020/2021: https://mkweather.com/2020/09/24/updated-forecast-for-winter-2020-21-still-nao-ao-in-first-half-of-winter-nao-ao-in-second-half-of-winter-permanent-la-nina-and-surprisingly-easterly-qbo-possible/
Moreover, extreme strong hurricane season 2020 with anomalous Greenland high is affecting Europe during the first half of Autumn 2020 /https://mkweather.com/2020/10/11/atmospheric-circulation-in-northern-hemisphere-europa-and-north-america-during-the-first-half-of-autumn-2020// with result of extreme returning coldwaves in Europe from August to October 2020 (and expected too from November to January 2020).
Mentioned circulation effects has signed on extremely cold conditions in western and northwestern parts of Europe during the first weeks of astronomical Autumn 2020. Portal electroverse.net and Météo France has informed, that the first 3 weeks of autumn 2020 were in France the coldest since 1998 and that England set for its coldest October in record.
In France, the first 3 weeks of autumn 2020 has been (or the period 21.-9. October 2020 (but third October pentade and the rest of the month will be very cold, too) with temperature anomaly -2,1°C from long-term temperature average according to Météo France.
Cold conditions are now forecasted until the end of October 2020, the warm spell between 20.-27. October has been deleted from the new runs of GFS and warmer weather shoud hit mainly Mediterranean for few days. Rest of continental Europe will be cold and will be large regions, with every day until the end of the month with negative temperature anomalies from long term average in Europe.
Mkweather soon brings the update of cold forecast for Europe for incoming period.
The start of Autumn 2020 in France according to Météo France and electroverse.net:
