It appears, that Poland will be one of the most hit country by anomalous Siberian blast already at the weekend and early next week! 
Poland, Lithuania, Belarus, Ukraine, Latvia and Russia , Scandinavia and then parts of Slovakia, Czechia and Romania an extremely cold Arctic days, with maximum temperatures below -10°C. 
But, these Arctic days won´t be mainly in parts of Poland, Lithuania or Belarus usual – in eastern Poland and Lithuania should appear days with maximum temperatures below -15°C and in Belarus below -20°C! 
In lowlands  below -20°C, rarely below -25°C, while Carpathian basins and valleys below 800 MASL minimum temperatures up to -30°C, maybe exceptionally a few degrees Celsius lower! 
Good news for lovers of winter is, that second Siberian coldwave around 28. January 2021 is confirming , for now, therefore, we can´t fully confirm, that Siberian blast of upcoming days will be an absolute peak of Winter 2020/2021 in the region.
However, all-time, daily, or temperature records 
Already during the night from Thursday to Friday should appear  above Europe some interesting minimum temperatures , but Saturday´s, Sunday´s, Monday´s and Tuesday´s mornings will be totally critical 
Mkweather will watch situation  in the Alps, Czechia, Slovakia, Poland, Romania, Scandinavia and Eastern Europe and already next hours and days brings fresh news about measured severe frosts  in continental Europe, therefore, stay watch with us / stay safe . 
Infographics: wxcharts.com, wetterzentrale.de 
Temperatures at 15:00 on Sunday, 17. January 2021: 
Maximum temperatures: 
Minimum temperatures: 
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