A component-based approximation for trend detection of intense rainfall in the Spanish Mediterranean coast

Rainfall behavior is a fundamental issue in areas with scarce and irregular amounts, such as the Spanish Mediterranean region. We identified 12 spatial patterns that characterized 899 torrential precipitation events (≥150 mm 24 h) occurred 3,537 rainy series period 1950–2020. Three of these components––eastern ESE––showed positive significant trends their accumulated volumes. then mean synoptic causes 10 most intense each component at both sea-level pressure 500 hPa geopotential height, also integrated water-vapor transport between 1,000 300 hPa. found clear distribution pluviometric effects related to unstable atmospheric situations (such troughs cut-off lows), SW–SE advection fluxes brought moist air from Western Mediterranean. In particular, rainfall Balearic Islands more E–NE advections than southeastern ones. determined major parts components early autumn, especially September October. expect findings help our understanding processes leading catastrophic along coast lead improvements alert systems management plans. • The were divided into geographical based on NNMF method. Atmospheric instability led proportion situations. Southerly favor moisture transport.