Hydrometeorological droughts in the Miño-Limia-Sil hydrographic demarcation (NW Iberian Peninsula): The role of atmospheric drivers

. Drought is one of the world’s primary natural hazards because of its environmental, economic, and social impacts. 15 Therefore, monitoring and prediction for small regions, countries, or whole continents are challenging. In this work, the meteorological droughts affecting the Miño-Limia-Sil Hydrographic Demarcation in the northwestern Iberian Peninsula during the period 1980–2017 were identified. For this purpose, and to assess the combined effects of temperature and precipitation on drought conditions, the one-month Standardised Precipitation-Evapotranspiration Index (SPEI1) was utilised. Some of the most severe episodes occurred during June 2016–January 2017, September 2011–March 2012, and December 2014–August 20 2015. An empirical orthogonal function analysis revealed that the spatial variability of the SPEI1 shows strong homogeneity in the region, and the drought phenomenon consequently behaves in the same way. Particular emphasis was given to investigating atmospheric circulation as a driver of different drought conditions. To this aim, a daily weather type classification based on Lamb weather type (LWT) classification was utilised for the entire Iberian Peninsula. Results showed that atmospheric circulation from the southwest, west, and northwest are directly related to wet conditions in the Miño-Limia-Sil 25 Hydrographic Demarcation during the entire hydrological year. Contrastingly, weather types imposing atmospheric circulation from the northeast, east, and southeast are

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