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Convección en la tormenta tropical Delta en un clima más cálido
No full textPresentación realizada en: I Congreso SINOBAS de Aficionados a la Meteorología, celebrado los días 18 y 19 de octubre de 2025 en Valladolid
Pequeño análisis de la supercélula que recorrió parte de la provincia de Albacete el día 24 de julio de 2025
No full textPresentación realizada en: I Congreso SINOBAS de Aficionados a la Meteorología, celebrado los días 18 y 19 de octubre de 2025 en Valladolid
Western Mediterranean flash floods through the Lens of Alcanar (NE Iberian Peninsula): Meteorological drivers and trends
No full textFlash floods in the Western Mediterranean pose a growing hazard due to the effects of climate change, rapid
urbanization, and land-use changes. This study focuses on flash floods in the Montsia region of southern Catalonia (NE Iberian Peninsula), with particular emphasis on the municipality of Alcanar, because it illustrates the
recent intensification of flash flood dynamics in the Western Mediterranean. The research is motivated by three
recent severe flood events in Alcanar (2018, 2021, and 2023), each characterized by extraordinary rainfall totals
and significant economic losses, unprecedented in the municipality’s 30-year observational record. Methodologically, we integrate multiple data sources—including meteorological station observations, weather radar
products, lightning detection networks, high-resolution mesoscale model outputs, and a flood database spanning
1980–2023, complemented by economic compensation records from 1996 to 2020. Through this approach we (i)
assess the regional frequency of heavy rainfall and flood episodes, (ii) quantify the economic impacts in Alcanar,
(iii) characterize the meteorological and thermodynamic conditions on the three most intense recent events
(including moisture source tracking via a Lagrangian methodology), and (iv) analyze spatio-temporal trends in
extreme rainfall indicators (percentiles, threshold exceedances, kurtosis, and skewness). Our findings suggest
that, from a meteorological perspective, current flash flood behavior in the Western Mediterranean likely
emerges from the interplay of localized orographic triggers, elevated sea surface temperatures, strong instability
associated with low-level moisture, particular positioning of jet streaks, synoptic-scale cut-off lows, and remote
moisture sources. The results also point to an increase in rainfall intensity, explained by the presence of high
precipitable water content and shallow convection, which enhances precipitation efficiency. These insights
highlight the critical need for robust flood early warning systems, strategic watershed management, and
improved risk communication to mitigate escalating flash flood risks in the Montsia county and similar areas
throughout the Western Mediterranean region.This study has been supported by the Spanish Project C3RiskMed
(PID2020-113638RB-C22 funded by MICIU/AEI/10.130
39/501100011033) and from the European Union’s Horizon 2020
Research and Innovation Programme under grant agreement No
101037193, I-CHANGE. It has also received the support of the AGAUR
project 2021SGR01074
