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The first days of this week are influenced by a circulation of warm air of oceanic origin. This circulation is accompanied in these hours by the reinforcement of a subtropical anticyclonic wave that brings temperatures higher than the average for the period. The anticyclone that extends from the Atlantic Ocean to the central Mediterranean will tend in the coming days to become increasingly unbalanced towards the northern latitudes, conquering the North Atlantic, thus pushing cold air masses towards the southern latitudes of Europe. A surge of unstable arctic air will hit central Europe and finally the Italian boot just around the Christmas holidays. The passage of the cold air core at high altitude will be accompanied by a cloudy body associated with some passing precipitation first to north (Friday 25) then also to center ed al South (Saturday 26). A generous drop in temperature is expected on Boxing Day, particularly noticeable in the north and on the eastern slopes. Estimated temperatures expected from LAMMA model in the part of about 1500 meters in Saturday morning 26:
The anticipated outburst of cold Arctic air at Christmas time will be overwhelmed by the breakneck pace of a deep low-pressure vortex hitting Europe between Sunday 27 and Monday 28 December. Breaking off Greenland and traveling over the warm waters of the Atlantic Ocean, this new circulation depression will be ruled by strong winds. A notable contribution of cold air from the polar sea will flow into this vortex.
The axis of this depression could be located in a portion of territory between the United Kingdom, France and Spain, causing Italy a wind rotation from the southern quadrants. Monday 28 and Tuesday 29 December would therefore be two days marked by a rise in temperature in the center and south, while the soft Mediterranean air would meet running on a cushion of colder air deposited in the Po Valley. With these assumptions, between Sunday and Monday, some northern regions could see snowfall up to flat altitudes. Analysis of US model GFS referred to Monday December 28:
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