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Situation
A depression, named FLORIANE, is deepening in the near Atlantic. The associated disturbance quickly crosses France this 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 the Cévennes. 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 100-110 km/h in departments with orange alert
– heavy rains in the Ardèche Cévennes with 50 to 90 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 Monday at 7 a.m.the wind strengthens significantly in the west with the arrival of Floriane. We record 110 to 120 km/h on the Channel coast, towards Fécamp or Barfleur. The wind continues to blow strong in the center-east with 105 km/h recorded in Les Sauvages in the Rhône.
Precipitation is also marked as the disturbance passes, with more than 30 mm already recorded in the last 24 hours in the Meuse, in Malancourt for example.
Evolution
Monday at midday, while the wind will begin to weaken in Rhône-Alpes and the Saône Valley, it will blow strongly from Île-de-France to the north of Burgundy to Champagne, the Ardennes and the north of Lorraine and the ‘Alsace with gusts that can approach 100 km/h as stormy rain passes. At the same time, it will rain heavily in the Cévennes.
Monday afternoon and early evening, a snowstorm will envelop the southern Alps. It will rain heavily in the Cévennes with thunderstorms. The wind will blow violently between the Ardennes and Lorraine at 100 km/h until 4 p.m. before quickly improving.
From Monday 6 p.m., Most of the unrest will have passed and this alert will then be lifted.