Météo-France places 23 departments on orange storm alert as severe weather moves east

Severe storm front sweeps eastward

A severe storm system moved across mainland France on Thursday, 27 August, generating intense thunderstorm cells, large hail, and damaging winds as it tracked toward the eastern regions. Meteorological forecasts warned that the storm cells could produce hail measuring between 2 and 5 cm in diameter, hourly precipitation rates reaching up to 30 mm, and localized wind gusts of up to 100 km/h or higher. The atmospheric disturbance affected the entire country, temporarily easing over western departments overnight before intensifying again during the afternoon. Forecasters identified two primary corridors of activity, stretching from northern Auvergne into Burgundy and the Vosges, as well as an axis spanning Pays de la Loire, Normandy, and Hauts-de-France.

There is a marked risk of violent phenomena.

Departmental warnings and shifting alert levels

Weather warning designations fluctuated substantially across French departments between Wednesday night and Thursday evening. Météo-France initially lifted the orange thunderstorm vigilance for all departments at 02:00 on Thursday morning as initial storm bands subsided. By 10:00 on Thursday, the national forecaster upgraded 39 departments back to orange status in anticipation of renewed storm activity. An initial six departments (Allier, Cantal, Puy-de-Dôme, Loire, Saône-et-Loire, and Côte-d'Or) had been slated for orange alerts starting at 16:00 before warnings expanded across broader administrative regions, including Grand Est, Auvergne-Rhône-Alpes, and Occitanie.

By 22:00 on Thursday, Météo-France lifted the orange thunderstorm alerts for both Île-de-France and Hauts-de-France while maintaining warnings across 23 departments in central and eastern France. The remaining 23 departments under orange alert included Allier, Aube, Aveyron, Cantal, Corrèze, Côte-d'Or, Creuse, Loire, Haute-Loire, Lot, Haute-Marne, Meurthe-et-Moselle, Meuse, Moselle, Nièvre, Puy-de-Dôme, Bas-Rhin, Haut-Rhin, Haute-Saône, Saône-et-Loire, Vosges, Yonne, and Territoire de Belfort.

Storm damage and earlier severe weather

The Thursday storms followed a destructive front that crossed western France on Wednesday evening, resulting in property damage and emergency mobilizations. Wednesday's severe weather left one person injured, cut electricity supplies to private households, and tore roofs off buildings across multiple municipalities. Firefighters in the Charente-Maritime department responded to nearly 200 emergency calls related to the storm impact.

Weather monitoring stations recorded significant measurements during the Wednesday passage. Wind speeds reached 98 km/h in Blois within the Loir-et-Cher department, while rainfall totals exceeded 40 mm in both La Gaubretière in Vendée and Nueil-les-Aubiers in Deux-Sèvres. The mid-week storms arrived shortly after violent weather crossed southern France during the night between Monday and Tuesday, which included a tornado that struck the village of Pomas in the Aude department on Monday.

Heatwave conditions in Corsica

While northern and eastern regions prepared for convective storms, southern territories experienced extreme summer heat. Météo-France placed the island of Corsica under an orange heatwave alert, applying the warning to both the Corse-du-Sud and Haute-Corse departments. Daytime temperatures across the island were forecast between 31°C and 34°C, with local thermometer readings climbing up to 36°C in the Sartenais area.