Pool of extremely cold air over northeastern Europe, with significant and aggressive Siberian outbreaks in Europe during next 2 weeks is taking its taxes - cold winter conditions thanks to persisting, or prolonged NAO- phase, should returning during the first half of February 2021, too, according to new ECMWF forecasts.
Long-term forecast from the start of January 2021 /https://mkweather.com/2020/12/29/in-2021-spring-come-earlier//, that in February comes early Spring, therefore have to be updated /https://www.ecmwf.int/en/forecasts/charts/.
In comparison with 2 weeks old outputs, cold conditions with possible strong Siberian blasts in Europe should be prolonged for 2 - 3 weeks.
Previously, arrival of NAO+ phase was expected already at the end of January 2021, with gradual early spring conditions, with Azorean high above Europe, with temperatures +10/+15°C, very rarely up to +20°C in mid-latitudes of European continents, and possible summer days in Mediterranean (+25°C and more).
Although, extreme Siberian winter will be the most probably the strongest around next 2 weekends /https://mkweather.com/2021/01/12/european-coldwave-is-owerwriting-history-next-2-weekends-will-be-critical//, extreme cold air should hold in northeastern parts of the continent during the first 2 February weeks, with additional potential of Siberian cold blasts in Europe.
Only after 15. February is finally forecasted NAO+ phase, with possibility of persisting NAO+ and very warm start of the Spring 2021 during March 2021.
After warm temperature records in March 2021 and possible early summer days in many parts of Europe /above +25°C/, again NAO- is forecasted for April and possibly May 2021, what means, that late coldwaves should damage a harvest this year again.
Seasonal forecasts for Spring 2021 for continents will be main topics on Mkweather immediately after the end of extreme Siberian coldwaves of upcoing weeks.