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• Analyzed atmospheric and tide gauge data of hurricane leslie to study the combined effects of storm surge and meteotsunami. • Proposed a new numerical scheme combining storm surge and meteotsunami. • Identified the origin of the tsunami-like waves near leixões (north of Portugal) through numerical simulations. In recent years, Portugal's coastal regions have experienced an increase in the frequency and intensity of severe weather events, including tropical cyclones and extratropical storms. This paper presents an analysis of Hurricane Leslie(2018)'s impact on Portugal, with a specific focus on the complex and often underestimated meteotsunami phenomena accompanying the storm system. Our analysis examines data collected from multiple sources, and employs advanced numerical simulations, integrated within the GeoClaw framework. These simulations encompass both storm surge and meteotsunami effects. One of the findings is the significant role played by meteotsunamis in amplifying coastal sea levels during extreme weather events. The observed sea-level fluctuations closely align with the combined surge-meteotsunami simulations, emphasizing the importance of considering these high-frequency phenomena in coastal hazard assessments. [ABSTRACT FROM AUTHOR]

On 6 and 7 July 2010, uncommon sea waves were observed along the coast of Portugal. The Portuguese tide gauge network recorded the sea-level signals showing tsunami-like waves of heights varying from 0.14 to 0.6 m (crest-to-trough) and of periods in the range of 30 to 60 min. Analysis of both oceanic and atmospheric data revealed the occurrence of a meteotsunami in the night of July 6th that propagated from Lagos, south, up to Viana, north. Here, we present the first investigation of the 2010 meteotsunami that struck the coast of Portugal. We use the atmospheric pressure data to force the sea surface and numerically generate the 2010 meteotsunami. We then simulate the 2010 meteotsunami propagation over high-resolution bathymetric models using a validated nonlinear shallow water code. The comparison of the simulated waveforms with the records shows satisfactory agreement of wave heights and periods in most stations. Taking the 2010 event as a reference of meteotsunamis along the Portuguese coast, we further provide an insight into the meteotsunami hazard posed by events propagating from south to north of the country. This is done by considering a 2D Gaussian-shape pressure disturbance that propagates along the shelf under varying conditions of speed and incident angle. This allows identifying "hot spots" on the coast of Portugal where the focus of meteotsunami energy is favourable. Our results suggest that meteotsunamis present a real threat on the highly occupied Portuguese coast and therefore should be considered in tsunami hazard and forecasting strategies of the NE Atlantic countries. [ABSTRACT FROM AUTHOR]