Cold air colliding with humid air over Spain is bringing violent storms and sudden downpours, while temperatures fall sharply. Catalonia is at the centre of the threat. Officials warn of up to 40 litres per square metre in an hour and more than 100 litres in a few hours in some places. The State Meteorological Agency (Aemet) says these totals are already confirmed for the worst-hit coastal and pre-coastal areas of Barcelona, where local drains may not cope.
Aemet has put twelve autonomous communities on rain or storm alert. Catalonia is under a critical orange warning, with the worst expected after 21:00. The Prepirineo, Barcelona’s coast and pre-coast, along with the central depression, are in the crosshairs; up to 90 mm of rain could fall here in less than three hours, creating a real risk of flash floods. Orange is Spain’s highest active warning. Catalonia faces more danger than the other regions, which are under yellow alerts.
Meteocat has also escalated warnings for Catalonia, focusing on Barcelona and Tarragona on Monday, then Girona and Lleida on Tuesday as the storm system shifts.
Other regions are also at risk. Aragón, Extremadura and Castilla y León, along with much of northern Spain, including Asturias, Cantabria, Galicia, Navarra and the Basque Country, are under yellow alerts. Heavy rain and hail are possible, along with wind gusts of up to 90 km/h. Andalucía has been on alert since early morning, with Grazalema and the Estrecho, as well as parts of Málaga and Huelva, bracing for downpours and hail. These yellow alerts indicate a real risk, though it is lower than Catalonia’s orange warning.
In the Valencian Community, the interior of Castellón and Valencia are on alert for storms that could bring 20 litres per square metre in an hour. Castilla-La Mancha, Ceuta and parts of Castilla y León are also under yellow warnings. Hail and sudden wind surges add to the threat. Aemet says the dangers are highly localized: sudden downpours and storms can trigger flash floods within minutes.
A mass of cold air high above Spain is making the atmosphere unstable, with thick clouds spreading across the country. Local storms are developing, some with hailstones up to two centimetres wide. Temperatures will plunge across most of Spain, while Galicia and the Cantabrian coast will get a rare warm spell. The Balearic Islands will barely notice a change. AccuWeather, citing Aemet, says international forecasts also support the orange alert for Catalonia.
Aemet says the most dangerous rain is expected in Catalonia. The Servei Meteorològic has raised the risk to 4 out of 6. The threat will last through the night and into Tuesday. Tarragona’s coast and pre-coast could see 100 litres per square metre in twelve hours. Lleida is under yellow alert for 20 litres in an hour, hail and strong winds.
Elsewhere, the pattern includes sudden, heavy showers and short but fierce hailstorms, with wind gusts that could disrupt travel and outdoor plans. The Mediterranean coast, Balearic Islands, Galicia’s shoreline and the Strait of Gibraltar will see low clouds and light rain. Unsettled weather will continue.
For those watching Spain’s wild weather, these warnings echo the earlier surge in storms that have repeatedly tested local infrastructure and emergency crews.
Orange alerts mean a risk to daily life, while yellow warnings flag dangers for certain activities. Residents are urged to stay alert as the next hours test communities across Spain. Catalonia faces the biggest threat, with torrential rain and hail, as well as wind, bringing the risk of sudden disruption. Local readiness matters as storms grow stronger and more frequent.
