A **depression**—a low-pressure weather system—is moving from the Bay of Biscay toward northern France between Tuesday and Wednesday, bringing heavy rain, thunderstorms, and the potential for flooding. Two departments are under an **Orange Alert**, which means a high risk of severe weather, while seven or eight departments are under a **Yellow Alert**, indicating a moderate risk. This weather pattern is caused by warm, unstable air rising from southern France and cold air descending from the Atlantic, creating conditions for strong rain and thunderstorms starting Tuesday evening.
By the end of Tuesday, thunderstorms with heavy rain and locally hail will affect the region of Nouvelle-Aquitaine. At the same time, heavy rain and thunderstorms will move into the Languedoc and Cévennes areas, advancing toward the PACA region on Wednesday. Rainfall totals in some areas could reach 40 to 60 mm in a short time—equivalent to 15 days of precipitation—particularly from Lot-et-Garonne to Dordogne. These storms may be accompanied by hail and strong winds.
In the Languedoc and Cévennes, moist and unstable air will rise from the Gulf of Lions, causing rain to intensify. Strong thunderstorms will persist in Nouvelle-Aquitaine during the early part of the night before moving northward by midnight. Over the Languedoc and Cévennes, thunderstorms will break out with heavy rain, especially over the Cévennes terrain, where significant runoff and flash flooding are possible.
Despite the approaching storm, much of France will remain warm on Tuesday, with temperatures reaching 25 to 28°C, particularly in the north and east. This follows a very hot September, with summer lingering into early October. However, the change in weather on Wednesday will bring a noticeable drop in temperatures. By the weekend of October 10 and 11, conditions in the north will remain somewhat mixed but will gradually improve.
In the Hérault department, **Météo-France** has placed Hérault and Gard under an Orange Alert for rain, flooding, and thunderstorms during the evening of Tuesday, October 6. The weather event is expected to continue through the night and improve on Wednesday morning. Up to 120 mm of rain could fall in a short period, with the most significant impact in the first foothills and mountain slopes. The situation is expected to worsen during the night, with rains affecting a large part of the area.
In the southeast, the risk of rapid runoff and localized flooding will increase during the night and on Wednesday. The most critical period is expected on Wednesday, with 100 to 150 mm of rain possible in the Cévennes and 80 to 100 mm in a few hours in the PACA region. Heavy rains will spread to the lower Rhône valley and then to Provence. Residents are advised not to drive on flooded roads and to limit travel during the heaviest rain periods.
Severe Weather Alert Across France as Depression Moves In
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