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Thermodynamic and dynamic atmospheric stability indices will be analysed inorder to classify the rainfall types occurred in western Iberia and provideinformation about the associated meteorological phenomena and preferredregional instability sources. In this work, instability sources over thewestern Iberian Peninsula will be characterised by means of radiosondestation data and reanalysis data sets from the European Centre forMedium-Range Weather Forecasts (ECMWF), for the period 1971–2002. Dynamicstability indices such as the Q vector divergence (dQ) or the potentialvorticity anomaly in the 330 K isentropic surface (PV) have been calculatedwith the aim of establishing different atmospheric stability scenarios.Furthermore, thermodynamic atmospheric stability contribution has been alsoevaluated with Total Totals index (TT) and moisture availability wasinferred from circulation weather types (CWTs). The first results of thiswork assess the combined dynamic-thermodynamic preferred conditions,synoptic situations and humidity sources, leading to precipitation eventsover the western Iberian Peninsula and prove the essential role of CWTpatterns on the rainfall genesis

Atmospheric instability analysis and its relationship to precipitation patterns over the western Iberian Peninsula