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Since the last satellite capture, the two leading baric figures of the Christmas season are clearly visible: a high pressure blockade over the Eastern Ocean and up to the United Kingdom and a large depression area with a fulcrum located between Lithuania and Belarus, but it spread to much of northeastern Europe and parts of the Baltic. The gearing action of the two baric figures is already diverting rather cold air from Arctic-Scandinavian extraction toward Denmark, Germany and France. At this time of Christmas Eve night, the cold air swept through all of Central and Northern Europe, and the snowfall spread to low altitudes in south-central France, near Lyon and others in southern Germany, perhaps here in higher altitudes of medium-high hills.
At the moment the cold hardly touches the Alpine sectors but, little by little, it will advance towards the south, avoiding the Alps in the morning of tomorrow and breaking mainly the Gulf of the Lion, the Rhone Valley, it will break into the center-north and west from the Mediterranean. in the course of tomorrow. Already in the morning, the first cold currents will lead to widespread rains in the northeast, but especially between southern Lombardy, southern Veneto, Emilia-Romagna and eastern Liguria. The precipitations also spread in the lower Piedmont. In the morning, local snowfall, especially in the Emilia-Ligurian Apennines and in the extreme north of Tuscany, will begin to fall around 600/800 m, in air that is not yet particularly cold. Meanwhile, western currents will thicken the clouds over the Tyrrhenian areas, especially those relating to the Apennines, with local rains scattered from Tuscany to Lazio and up to Campania, northern Calabria and western Sardinia. Thickening and scaling at lower-middle altitudes in the Alps and Pre-Alps, especially in central and eastern Europe.
The most intense deterioration, however, will occur in the afternoon and then at night, when the cold air will enter our basin more decisively, even from the port of La Bora, activating a low pressure, on average located between the Middle-Upper Tyrrhenian Sea, Tuscany, Emilia-Romagna, Umbria and the Marches. Precisely from the afternoon, the rains and showers will be heavy in Emilia-Romagna, with snowfalls at gradually lower altitudes, up to 300/400 m at night, in particular in the reliefs of the Emilian Apennines, all of them, in the from northern Tuscany, locally in the inland Ligurian areas of Levante and Southeast Piedmont. Calm clouds with scattered showers and showers between south-central Veneto, southeast Lombardy, widespread rains between Tuscany and all areas of Tyrrhenian, Lazio, Campania, Calabria, western Sicily and western Sardinia, more intense between Lower Lazio, Western and Western Campania allowed. Flakes, but quite weak and irregular, down to low altitudes in the Alps and Pre-Alps, especially in the center-east and, at night, it snows up to 600/800 m also in the center of the Apennines, occasionally in the central reliefs of Sardinia .
The weather will improve in the lower-middle Adriatic, in the Ionian regions, in central-eastern Sicily, in southern Calabria, in eastern Sardinia and widely in the rest of the north, especially in the northwest, between Piedmont and Lombardy . Temperatures will drop significantly, especially after dark, in the North Central. Finally, the winds are expected, all to intensify from the western quadrants, moderate or strong in the Apennine and Tyrrhenian areas, all of them strong or locally violent in the basins of northern Sardinia and in north-central Tyrrhenian.
Below are the pages to monitor the situation in real time, here are the images from radars, satellites and live rays:
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