The 3rd of November 2011, the Hérault River reached a red vigilance level on the Vigicrues flood-watch site whereas on the Météo France weather vigilance map 3 Departments (Hérault, Aveyron, Lozère) went red and 5 Departments (Tarn, Bouches-du-Rhône, Haute-Loire, Gard et Ardèche) hit orange vigilance levels with respect to serious flood risks. The red vigilance level was triggered upriver due a "confirmed intensification of precipitation expected for the end of the afternoon and the following night" according to a Météo France communiqué. "Over the Cevennes chain, rainfall was recorded at between 150 and 250 mm, cumulating locally at 300 mm. This rainfall event is worrying by its duration, but equally because of the risk of locally intense downpours" affirms Météo France. Furthermore, a strong East to South-East wind was announced, with gusts of 80 to 100 kmph on the coast, which could lead to a sea level rise and the filling-up of coastal river estuaries.
P02 - Disaster Extent Map - Detail
P01 - Disaster Extent Map - Overview