O Saturday, forecasts are relative favorable for extreme coldwave for the same region, but in very dry air on the south side of robust blocking Scandinavian high.
Air below -5°C in 850 hPa over central Ukraine and 0/-5°C in 850 hPa over Poland, Slovakia, Romania, Latvia, Lithuania, Estonia and Moldova could bring in this extermely cold air mass, 12°C below long-term temperature average, really heavy frosts, mainly to the Carpathian basins, but to in lowlands in region.
In Basins and valleys in 300-800 MASL, frosts -2/-8°C are between 22.-27. September according to current runs of GFS possible and in lowlands from Baltic states, trough Poland to Romania, minimum temperatures +3/-2°C could appear during the period.
If in lowlands won´t be a frosts, so will be a ground frosts, because in dry air such this, temperature differences between 2m and 5 cm level can be around, or slightly more than 5°C.
During next week, Mkweather will be updating a forecasts for first serious frosts (or snow) in continental Europe. It seems, that coldwave comes, so will be prepare to protect harvest and flowers, mainly in Baltic states, East-Central Europe, Eastern Europe and NE Balkan.
Expected temperature in 850 hPa during the peak of coldwave in 3rd September 2020 decade /wxcharts.com:
T850 hPa anomaly from long-term average from 22. to 27. September 2020 over Europe /wetterzentrale.de:
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