The night came in under the forecast

On Monday morning Météo-France wrote that if its scenario of very intense, possibly stationary storms was confirmed, “a move to red vigilance would then be expected” for the Hérault and the Gard³. The Hérault prefecture passed on the same message: a risk of the warning being raised to red from the middle of the day³. The agency’s episode note put the expected totals on the eastern Hérault and the Gard at 200–250 mm, locally 300 mm².

At 04:06 on Tuesday the bulletin read differently. Nine départements are orange and none is red¹. The Gard is orange for rain-flood, storms and floods; the Hérault is now orange only for floods, with its rain-flood and storm risks down to yellow¹. The Aveyron and the Lozère are orange for floods. The new orange cells lie to the east: Ardèche, Bouches-du-Rhône, Haute-Corse, Var and Vaucluse¹. Twelve more départements are yellow¹.

The gauges were less dramatic than the models. By about 16:00 on Monday, Nîmes had recorded some 35 mm since the start of the day, Saint-Gilles 48 mm, Saint-Hippolyte-du-Fort 50 mm and Le Vigan 60 mm, “less than the weather forecasts feared”, as Midi Libre put it⁴. In mid-afternoon the models lowered the expected intensity, and the episode was calm enough that the emergency services in the Gard had not been called out⁴. By 18:00 the private network Météo Ciel showed 79.7 mm on Mont Aigoual and 73 mm at Le Vigan³.

The storm went elsewhere. On Monday evening Météo-France brought the Bouches-du-Rhône’s orange forward from Tuesday to that same evening, describing a rain-and-storm line over the Côte Bleue and Fos producing about 50 mm in an hour³. The local forecasting page Météo Méditerranée 34 wrote that the situation on the ground was “far from the scenario” the models had shown that morning³.

A vigilance map is not a promise of disaster. It is a probability turned into instructions. When the most likely bad outcome does not arrive, the honest reading is not that the warning was wrong. It means the precautions were bought at the low price, before anyone needed them.

The precautions are worth listing, because this is where the system works. The Gard closed eight departmental roads in advance, including submersible bridges on the Cèze, the Vis and at Anduze⁴. Nîmes closed its municipal and intercommunal facilities from 16:00 on Monday until Tuesday noon, crèches and leisure centres included, with emergency childcare and a minimum service kept open⁴. Montpellier closed its parks and the Lez reserve, banned parking on the quai du Pirée and opened two gymnasiums from 19:00 for anyone who needed a roof³. Speed limits on the motorways were lowered by 20 km/h for cars and to 70 km/h for lorries³.

None of this is glamorous. All of it targets the one behaviour that kills most people in these episodes. Météo-France’s own reminder is that the main cause of death in a flood is driving on submerged roads and crossing submersible bridges over rivers in spate³. A closed bridge costs a detour. A crossed one can cost a life.

Rain is the fast part of a Mediterranean episode, and rivers are the slow part. That is why the orange stays on the flood column for the Gard, the Hérault, the Lozère and the Aveyron this morning, even where the rain warning has eased¹. The Lez, the upper Hérault, the Vidourle and the Vistre were placed in orange for floods until about midday on Tuesday³. The ground had a head start. The agroclimatologist Serge Zaka noted on Monday that soils in the area were already filled to 70–90% of their water-holding capacity after earlier storms³.

Across the border the same depression has already shown its other face. Spain’s weather agency named it Adam, the first name on the list it shares with Météo-France³. RTVE counts four dead in Spain, more than 450 people rescued and more than 1,500 incidents handled by Valencia’s emergency services. The state weather agency AEMET says the Safor district has seen nothing like it since November 1987⁵.

Météo-France expects the rain, still intense, to move east on Tuesday afternoon and evening into Provence-Alpes-Côte d’Azur and Corsica. That would end the episode in the départements hit first, and the rain would clear completely the following night². The machinery for following it is public and free. The vigilance map is updated at least at 06:00 and 16:00, and there is an ordinary-rate phone line, 05 67 22 95 00¹. Two automatic services, APIC and Vigicrues Flash, send SMS, email and voice alerts to subscribed prefectures, town halls and operators².

You do not need to read a weather model. You need to read the colour of your département before you drive, and believe it a little more than the sky.