Red alerts halt transit and shut schools as flash floods strike Gard and Hérault

Emergency alerts and red vigilance

Météo-France placed the Gard and Hérault departments under a red weather alert on Wednesday, 30 September 2026, with the warning remaining active until midnight. The neighbouring Lozère department was placed under an orange vigilance warning. Before dawn, emergency alert tones sounded on mobile phones across both red-alert departments, overriding silent modes to deliver prefecture warnings directly to residents. Regional authorities instructed the public to remain at home, avoid driving, and work remotely where possible. Météo-France warned that the Mediterranean weather system would spread intense conditions from the mountains to the coastal plains.

Thunderstorms and heavy rainfall accumulations, first hitting the Cévennes, will extend to the plains.

River surges and rescues in Gard

Overnight and morning rainfall concentrated heavily across the Cévennes range. Over a twelve-hour window, rain gauges recorded 224.2 millimetres at Colognac, 220.9 millimetres at Saint-Hippolyte-du-Fort, and 175.9 millimetres at Le Vigan. These intense downpours triggered a flash flood along the Vidourle river, which rose 3 metres in two hours at Saint-Hippolyte-du-Fort.

The surge submerged roads under 2 metres of water in Saint-Hippolyte-du-Fort, creating torrents that left multiple streets impassable. Enedis reported local electricity outages, while municipal officials ordered residents indoors. Emergency responders moved eight individuals to safety in Saint-Hippolyte-du-Fort, and rescued five motorists trapped inside submerged vehicles across Saint-Hippolyte-du-Fort and Tornac. Downstream in Quissac, the Vidourle entered streets, while authorities maintained close surveillance on the Gardon and Cèze rivers.

Urban runoff and forecasted peaks in Hérault

Conditions also worsened across Hérault as runoff created urban streams in Montpellier. Flooding affected several neighbourhoods across the metropolitan area and paralysed portions of the public transit network, particularly tramway services. Municipal officials warned that the most intense phase of the storm had not yet passed. According to the mayor of Montpellier, the storm system is expected to deliver its primary weather peak between 12:00 and 15:00, followed by a second peak between 20:00 and 23:00. The sub-prefect of Hérault stated that cumulative rainfall totals could double by the following day, projecting up to 300 additional millimetres in localized sectors as the weather system stalls over the department.

Transport disruptions and school closures

The severe weather prompted widespread closures of public infrastructure across both departments. Educational authorities shut all schools throughout Gard and closed facilities across eight designated sectors in Hérault. School transport was cancelled across Gard, Hérault, and Lozère, while parents in affected zones received instructions to keep children at home. Travel on regional roads and railways faced severe restrictions. Authorities lowered highway speed limits on the A9, A709, and A54 near Nîmes to 70 km/h for heavy goods vehicles exceeding 7.5 tonnes and 90 km/h for light passenger vehicles. Rail operator SNCF halted train services on routes between Marseille and Sète, Nîmes and Le Grau-du-Roi, and Nîmes and Clermont-Ferrand until the end of the day to ensure passenger and crew safety.