Catalonia floods kill two as Barcelona logs its wettest day in twenty years

Two people have died in Catalonia in a Mediterranean storm that also left one person missing, and Barcelona has logged rainfall totals the city has not seen in about twenty years. Regional president Salvador Illa confirmed the second death on Sunday. Civil protection sent a fresh Es-Alert to phones in five comarques: Vallès Oriental, Maresme, Selva, Baix Empordà and Gironès. The first death was a 75-year-old man from Tordera, killed on Sunday morning at the Camping Caravaning Internacional Costa Brava when a wall gave way and fell on him as he tried to clear water from his bungalow. The missing person was reported swept away by a watercourse at Pineda de Mar, north of Barcelona.

The rain figures are the part that will sit in the climate record. Meteocat measured 190.8 litres per square metre in the Eixample-El Raval, 170.3 litres on Avinguda Diagonal, the highest total there in eighteen years, and 152 litres near the Badalona museum, a record for that site in twenty-one years. At El Raval, 3.4 litres fell in one minute and 36.1 litres in half an hour. Those half-hour numbers are nearly double the 95.4 litres recorded in the same quarter on 24 March 2017. La Vanguardia reported 213 litres per square metre in 24 hours at the Can Bruixa station in Les Corts. Between 1 and 4 October, municipalities such as Les Cases d'Alcanar and L'Ametlla de Mar took close to 300 millimetres.

Rivers answered. The Besòs at Santa Coloma de Gramenet rose to 936 cubic metres per second and 3.60 metres, a surge La Vanguardia compared with the deadly floods of sixty years ago. That is a flow number, not a casualty number. It is also the sort of figure drainage systems in the metropolitan area are not built to take for long. Storm drains, metro entrances and the coastal railway all sit inside that catchment. A 936-cubic-metre pulse explains flooded underpasses more clearly than a general warning does.

The storm formed as a cluster of cells over the Mediterranean and drifted slowly onto the central and northern coast, including Barcelona and its second ring of towns. The sequence followed a summer in which the city had already broken heat records. Hot sea surface water does not by itself cause a 213-litre day. It does feed the cells that produce one when the upper pattern stalls. Meteocat's station data are the measurement. The sea-temperature link is the context, not a completed causal claim.

Illa's confirmation of the second death, and the Es-Alert to five comarques, are the administrative facts. The camping death at Tordera is the most fully described: a wall, a bungalow, a man clearing night rain. The Pineda de Mar disappearance is still a search. Two deaths and one missing is the human count as of Monday morning. The rainfall count is already large enough to rewrite local October records at Diagonal, El Raval and Can Bruixa. Municipal crews will spend the week on the Besòs banks and on streets that took a month of rain in a day. The next Meteocat note will say whether the cells have cleared or whether the five comarques stay under alert.

Drainage is the bill that arrives after the alert ends. A 936-cubic-metre pulse on the Besòs is a design load for river walls and a failure load for basement car parks built to older assumptions. Barcelona's October average is a fraction of 213 litres. Stations that beat eighteen- and twenty-one-year marks are not a one-off puddle. They are the dataset city engineers will cite the next time a metro mouth or a coastal road is rebuilt. The camping wall at Tordera is a smaller version of the same problem: a structure asked to hold a night of water it was not built for.