Storm leaves two dead and disrupts transport across Catalonia as Barcelona drainage limits damage

Casualties and emergency response in Catalonia

Heavy rainfall across Catalonia caused two deaths over the weekend, including a man found in a flooded garage in Montornès del Vallès. In Granollers, the epicentre of the severe weather, emergency services expanded search operations for Rami, a 12-year-old boy who disappeared on Sunday, 4 October 2026. The 112 emergency line logged 1,444 calls on Monday, while approximately 10,000 customers lost electricity across the comarcas of Vallès Oriental, Maresme, Barcelonès, and Baix Llobregat. Power company E-distribución deployed 360 workers and 20 generators to restore power to affected substations and residential areas. Granollers Mayor Alba Barnusell confirmed that schools would reopen on Tuesday following the initial emergency phase.

The rescue phase is fortunately now over.

Widespread commuter rail disruption

The rail network suffered severe operational failures as floodwaters inundated tracks and stations throughout the region. Adif deployed three water pumps at the Plaça Catalunya railway tunnel on Sunday night, working for three days to drain the underground structure and verify track safety. Floodwaters also covered the railway bridge over the Besòs river and submerged the tracks at Granollers Centre station, leaving railway lines R2, R4, R8, and R11 suspended or operating with partial routes. Commuter rail operator Renfe arranged replacement bus services across multiple corridors, including routes between Arenys de Mar and Maçanet-Massanes. Rail line R1 prepared to resume regular service between Arenys de Mar and L'Hospitalet de Llobregat on Tuesday.

Barcelona underground rainwater defenses

Barcelona recorded its heaviest rainfall since 1963, registering a citywide average of 197 litres per square metre and a local peak of 213 litres per square metre. While six homes were evacuated in the Cal Notari area of Horta-Guinardó due to hillside mudslides, the city prevented widespread street inundations. City officials attributed the outcome to a network of 15 underground stormwater retention tanks, which have a combined nominal capacity of 477,000 cubic metres. The municipal drainage system stored nearly 1.2 million cubic metres of runoff over the course of the storm by filling and emptying sequentially. Deputy Mayor Laia Bonet noted that the city plans to construct four additional tanks and has reserved land for 22 more.

In total, they have filled two and a half times. Today the circumstances in the city are difficult, but they would be much more so if the investment made had not been carried out.

Tropical cyclone formation in the Mediterranean

State Meteorological Agency (AEMET) meteorologist and researcher Juan Jesús González Alemán identified the weather event as a pure tropical cyclone formation rather than a standard medicane. While typical Mediterranean medicanes evolve from pre-existing mid-latitude low-pressure systems that gradually acquire tropical features, this event originated from organized clusters of intense convective storms that developed rotational dynamics directly over warm waters. González Alemán noted that climate change provides increasing thermodynamic energy for such systems in the Mediterranean basin. Observational data showed that rotational processes had initiated, though the system did not complete the full cycle initially predicted by weather forecasting models.

Previously it would have had to be a low-pressure system, and there was no low-pressure system formed, but rather this was a group of local convective storms that acquired such intensity that it began to evolve toward a greater scale.