After a weekend marked by the passage of a disturbance, the weather conditions will remain degraded.
This back-to-school week promises to be hectic, between sustained precipitation and strong winds.
After a fairly clear spell, yet another cooling is expected over the days.
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A start to the year marked by a new cold snap
Hectic weather to start the new year! With depressions circulating between the near Atlantic and Northern Europe, France is located under an atmospheric river synonymous with abundant precipitation. Thus, the disturbances follow one another with their share of rain, snow sometimes at low altitude and temperatures playing yo-yo. This situation will continue throughout the week with a mild spell followed by a sharp cooling from Wednesday. New bad weather could then occur all the way to the plain…
A (very) hectic start to the week
After an often wet weekend, a new ocean front will approach the west of the country on Monday with generally light, even moderate rain towards Normandy. They will be accompanied by a gale with gusts of up to 110 or even 120 km/h on the Aquitaine coast and between 80 and 100 km/h in the lands of Nouvelle-Aquitaine and as far as the central regions. This active disturbance will be preceded and followed by showers while locally sustained precipitation is expected in the Provence-Alpes-Côte d’Azur region.
The rain will also turn into snow above 1500 meters in the Alps, the Massif Central and the Pyrenees. Temperatures, on the rise, will return above seasonal norms with minimums generally between 4 and 13°C while maximums will most often exceed 10°C before dropping rapidly at the end of the afternoon by the northwest, change of flow requires.
On Tuesday, France will be in a cloudy sky with frequent showers expected from the Channel coast to the north-eastern borders and the Grand Est region as far as Lyonnais. These showers will occur locally in the form of rain and snow mixed north of the Seine due to the return of cold weather. During this time, a new zone of rain will approach the west via New Aquitaine while the Mediterranean rim and the South of Toulouse will find the sun again.
As a result of the drop in temperatures, it will snow on all mountain ranges at increasingly lower altitudes. While the mercury will approach 0°C at daybreak, the maximums will struggle to progress with barely 1 or 2°C under shelter in Lorraine, 4°C in Île-de-France and towards the Saône valley and up ‘at 10°C all the same on the Aquitaine and Mediterranean coasts.
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Towards further winter weather between Wednesday and Thursday?
After the rain, here comes the snow! A depression will cross the country between Wednesday and Thursday, causing a real conflict of air masses in its passage. Thus, the disturbance which will move towards the north of the territory on Wednesday will encounter cold air and the rain could well turn into snow from Normandy to the north of the Seine.
These winter conditions will shift eastwards on Thursday while showers will take over at the back. The reliability for the middle of the week nevertheless decreases significantly, with forecasting proving difficult more than 24 hours in advance in this type of situation. The parade of disturbances will continue on Friday with the arrival of more rain from the west, followed by showers on Saturday.
During this period, the Mediterranean regions will remain away from precipitation due to the presence of the mistral and the tramontane. Conditions will continue to dry out on Sunday, possibly marking a lasting return of the anticyclone. Until then, temperatures will be wintry, but not excessive with light frosts upon waking and maximums progressing with difficulty during the day.
