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Source-receptor water vapor content areas are analyzed for a particular caseof deep mesoscale convective system (MCS) developed over the Mediterraneanmargin of Spain in October 1982. The aim of this work is to studysimultaneously the atmospheric instability conditions and water vapourfluxes which finally resulted in very severe precipitation rates, reachingup to 600 mm in a single day. Humidity amounts and transport are quantifiedalong the trajectories computed from a lagrangian particle simulation model(FLEXPART6.2). To evaluate the precipitation probability, the water vaporcontent and both thermodynamic and dynamic atmospheric instabilitycomponents were assessed. The October 1982 Iberian MCS occurred as aconsequence of a deep cutoff low detected between 500 and 200 hPa levels.The dynamical instability was measured through potential vorticity anomaliesand Q vector divergence, which presented their maximum and minimum centersrespectively over south-eastern Iberia. Synoptic and dynamic instabilityconditions were obtained from the ERA-40 reanalysis dataset. It is observedthat during this severe weather episode, the specific humidity increasedalong the lowest and easternmost trajectories, which are mainly spread overthe Mediterranean Sea

Mesoscale convective systems in Spain: instability conditions and moisture sources involved