En kall Jul att vänta?
ECMWF projected geopotentials at 150 hPa (approx. 14 km altitude, lower stratosphere) of 7 December 2016 for 17 December 2016. The vortex over Canada is the stronger of the two. A powerful cold trough of the polar vortex (Rossby waves) lies across Eastern Europe, pumping in very cold polar air. A powerful high extends from the →