It’s winter before its time. After storms, floods and record rains, autumn will be marked in France by a drop in temperatures from Tuesday November 21. The cause, according to Météo France: a mass “cold air at altitude”who go “develop between Northern Europe and the central Mediterranean, plunging depressions towards Italy”.
From Tuesday November 21, average temperatures in France will be “slightly below seasonal norms », details the French establishment in its trends bulletin. “The weather should be dry around the Mediterranean and a little more unstable elsewhere. » In the Great West, temperatures of between 10°C and 14°C are forecast at the start of the week, and between 7°C and 10°C after Wednesday.
Drop in mercury and first frosts
Wednesday, “the feeling will become colder as the north wind picks up”ensures The Weather Channel . For his part, he forecasts a sudden drop in the mercury (-2°C) below seasonal norms from Thursday. “We will therefore have lost on average six degrees in France (…), the transition may be difficult. »
During the day, the maximums will range from 6°C in Alsace to 15°C near the Mediterranean. France, on the other hand, will experience its first frosts (between 0°C and -3°C) at night.
Snow on the mountains
This cold snap will also be accompanied by snowfall in France: “On Tuesday, showers will occur mainly in the form of snow over all mountain ranges in the country. Light snowfall, more regular in the Pyrenees, where a blockage of rain will set in and last on Wednesday », details Météo France. Up to 60 cm of snow is expected around 2,000 m in the Pyrenees.
These snowfalls will reinforce the snow already present at altitude. In Bourg-Saint-Maurice (Savoie), the snow should exceed 30 cm compared to 3 cm three days ago.
Read also: MAP. Which areas are most often affected by flooding?
Heavy rain and strong winds in Corsica
Showers will settle in Corsica from Tuesday, and the mistral and tramontane will strengthen. On Wednesday, significant rainfall is expected in Corsica. This time, they will also concern the eastern facade, which has remained sheltered from the precipitation of recent weeks, protected from the westerly winds by the Corsican mountains.
The thwarted decline in Pas-de-Calais
Shaken by floods for two weeks, Pas-de-Calais returned to orange this Monday, for new risks of flooding of several rivers. The clear drop observed over the past three days in the department has been slowed down by further precipitation, which could lead to a further rise in levels.
If the rainy episode is not “not at all exceptional”new precipitation “will water very reactive basins, whose soils are totally saturated”warns Vigicrues.
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