Identification of anomalous motion of thunderstorms using daily rainfall fields

Circulation weather types associated with extreme flood events in Northwestern Mediterranean

“…Characterization was carried out by means of the JC classification. While it is true that mesoscale factors play an important role in explaining the triggering and stationarity of convective systems that give rise to the heavy rainfall associated with flash floods and floods in this region (Rigo and Llasat, ; del Moral et al ., ), the synoptic framework is needed to explain dynamic forcing, synoptic advections and circulation (Ramis et al ., ; Martinez et al ., ).…”

Towards a better understanding of the evolution of the flood risk in Mediterranean urban areas: the case of Barcelona

“…Changes in land cover were analysed through the Land Use Maps of Catalonia, drawn up by the Ecological and Forestry Applications Research Centre (Centre de Recerca Ecològica I Aplicacions Forestals, CREAF) for the available editions (1956, 1993, 2000-2002, 2005-2007 and 2009). Runoff coefficients for different land uses were taken from Chow et al (1988). Population density since 1950 was provided by the Statistical Institute of Catalonia (Institut d'Estadística de Catalunya, IDESCAT).…”

“…In order to compare the different time editions and analyse the evolution of land use, all the maps have been homogenised in a common resolution of 2.5 m x 2.5 m and have been classified using 24 categories as used in LCLU-I. Taking into account the heterogeneity of the region and its hydraulic features, a streamlined method has been applied to estimate the runoff, based on the application of the runoff coefficients proposed by Chow et al (1988) for different return periods. Taking into account that the average slope in the MAB is between 2% and 7%, we considered that runoff coefficients only depend on the return period (Table 3).…”

10th European Conference on Radar in Meteorology and Hydrology (ERAD 2018) : 1-6 July 2018, Ede-Wageningen, The Netherlands

“…1); the Pyrenees to the north at an altitude over 3,000 m; the Central Depression to the west and the Littoral and Pre-Littoral ranges to the east. Convective activity mainly takes place during summer and autumn (Farnell et al, 2017;Rigo and Llasat, 2016;Rigo and Pineda, 2016;Cortès et al, 2017) and, as explained in the introduction section, a high amount of these thunderstorms present anomalous motion during their life cycle, such splitting, merging or stationarity (del Moral et al, 2017;Pascual 2005). …”

“…Some studies in Catalonia (NE of the Iberian Peninsula) have demonstrated that this type of severe thunderstorms usually present some kind of anomalous motion (i.e. split, merge, stationarity or sudden changes of direction) during their life cycle (del Moral et al, 2017;Pascual, 2005).According to Cotton et al, 2001 the motion of a thunderstorm is basically composed by three types of movement: the translation (synoptic factors), the forced propagation (mesoscale factors), and the auto-propagation (thunderstorm itself factors). Orographic boundaries, a veering and/or shear of the environmental wind, as well as the precipitation of the thunderstorm itself, which produces density currents from evaporating cooling, are some elements that may influence directly in these types of motion, among others (Lin, 2007).…”