Of
Sunday January 5 at 12:00 au
Monday January 6 at 6:00 p.m.
Situation
A depression is deepening on Sunday evening over the near Atlantic. The associated disturbance quickly crossed France during the day on Monday, causing strong winds in Rhône-Alpes and the Saône Valley, a gale from the Center-West to the North-East as well as heavy stormy rain in Brittany, on the Cévennes and the Alpes-Maritimes. Furthermore, heavy snowfall falls on the south of the Alps, from 1200 meters.
During this degradation, we wait
– winds at 80-90 km/h in departments with a high risk level and 100 km/h in departments with orange alert
– heavy rains in the south of Brittany, the Ardèche Cévennes as well as the Alpes-Maritimes with 50 to 80 mm possible corresponding to 2 weeks of precipitation in the month of January
– heavy snowfall in the south of the Alps with 50 cm around 1800 meters altitude
Monday evening, this windy rain-storm front will evacuate outside our borders, towards Germany, Switzerland and Italy and this alert will be lifted.
Observation
This Sunday at 12 p.m., the rains are well established in Brittany. Since yesterday, 20 to 50 mm have been recorded in the departments placed on alert, including 45 mm in Brennilis (29), 37 mm in Coray (29) and 30 mm in Quimper (29). The wind is getting stronger in Rhône-Alpes and blowing at 80 km/h in Mions south of Lyon.
Evolution
Sunday evening, the wind strengthens and reaches 90 km/h in Rhône-Alpes. The rains continue in Brittany.
During the night from Sunday to Monday, the wind continues to strengthen in Rhône-Alpes and in the Saône valley up to Dole at 90 km/h. The rains continue in Brittany, with intensities of 2 to 5 mm/h.
-Lundi matin, while the wind will continue to blow very strongly in Rhône-Alpes up to the Saône Valley at 100 km/h, it will be the start of the gale in the west with gusts to 110 km/h in Poitou-Charentes which will win Center-val de Loire before midday. At the same time, the rains will increase in the Cévennes.
Monday afternoon, while the wind will begin to weaken in Rhône-Alpes and the Saône Valley, it will strengthen from the south of Île-de-France to the north of Burgundy to Champagne, the Ardennes and the north of Lorraine and of Alsace with gusts that can approach 100 km/h as storms pass. At the same time, it will rain heavily in the Cévennes as well as the Alpes-Maritimes.
Monday late afternoon and early evening, a snowstorm will envelop the southern Alps. It will rain heavily in the Alpes-Maritimes and the Cévennes with thunderstorms. The wind will blow violently between the Ardennes and Lorraine at 100 km/h.
From Monday 6 p.m., and more surely after 9 p.m.most of the unrest will have passed and this alert will be lifted.
