Of
Saturday January 4 at 6:00 p.m. au
Sunday January 5 at 3:00
Situation
Within a conflict of air masses, an episode of snow/ice occurs north of the Seine with the arrival of a disturbance on still cold ground. The highest risk period extends from this Saturday 8 p.m. to Sunday 3 a.m.
A depression rises from the Bay of Biscay towards the British Isles. It causes a rise of fresh oceanic air in a southwesterly flow. Colliding with the cold air still present in the north this Saturday evening, mild snow or freezing rain will temporarily set in north of the Seine until the middle of the night from Saturday to Sunday.
The mild weather then invades the entire territory on Sunday morning, putting an end to this brief winter episode.
Observation
This Saturday at 3 p.m.the Atlantic disturbance is progressing and concerns all regions from the southwest to Brittany. In the regions between Normandy, the Paris basin, Hauts-de-France, Burgundy and Franche-Comté, after the bitter cold of the morning, temperatures are starting to rise with a slow thaw in progress under an overcast sky gradually.
Evolution
This afternoon
The rainy front associated with the mild spell moves back towards the central regions. With positive temperatures, the risk of slippery phenomena remains very low.
This evening
The front collides with the cold air still present north of the Seine and freezing rain sets in with roads becoming very slippery between Normandy, the Paris basin, Champagne, Burgundy and Franche-Comté. Ahead of the disturbance, light redoux snow occurs which can form a small layer of 1 to 3 cm between Seine-Maritime, Aisne and the Lorraine plateau.
This night from Saturday to Sunday
The disturbance reaches Belgium and all the north-eastern borders with icy weather until 2-3 a.m., particularly in Hauts-de-France, the Ardennes, Lorraine and northern Alsace. Then, the mild spell concerns all these regions and this special press release will then be lifted.
France
