Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 25 Precipitation: Measurement, Climatology, Remote Sensing, and Modeling (EGU Session 2009) 2010 10.5194/adgeo-25-79-2010 http://www.adv-geosci.net/25/79/2010/ http://www.adv-geosci.net/25/79/2010/adgeo-25-79-2010.html http://www.adv-geosci.net/25/79/2010/adgeo-25-79-2010.pdf 79 83 2010-03-16 Overview of the Greater Lyon weather radar advances from 90's to 2008 F. Renard frenard@grandlyon.org J. Comby UMR 5600 Environnement Ville Société CNRS, Lyon, France The local weather radar of Lyon, part of the Aramis network of Meteo-France, is currently located 40 km from the urban community. The measurement quality of this tool is subjected to constant improvements from Meteo-France. Indeed, its hydrological measurement quality has steadily evolved from the early 90's until today. This article, therefore, proposes a return on these innovations, assessing measurement quality over the territory of Greater Lyon. This study is based on two successive radar locations, and also on raw reflectivity data and on rain accumulation over the past 15 min (<i>Hydram</i>) or 5 min (<i>Panthere</i>). The measurement performed on the site Satolas was unsatisfactory because of too many ground clutters; and therefore the radar was moved to Saint-Nizier. This new location associated with radar <i>Hydram</i> rain accumulation has reduced the problem of ground clutters. These rain accumulation data have given correct results in comparison with local data of the raingauge network of Greater Lyon, after a global and spatially uniform correction, based on these gauges. The latest generation of radar rain accumulation (<i>Panthere</i>) has, nearly completely, eliminated the problem of ground clutter in the urban area and provides very satisfactory measurements, especially during intense rain events. Chapon, B., Delrieu, G., Gosset, M., and Boudevillain, B.: Variability of raindrop size distribution and its effect on the Z-R relationship: A case study for intense Mediterranean rainfall, Atmos. Res., 87, 52–65, 2008. Creutin, J. D., Borga, M., Lutoff, C., Scolobig, A., Ruin, I., and Créton-Cazanave, L.: Catchment dynamics and social response during flash floods: the potential of radar rainfall monitoring for warning procedures. Meteorol. Appl., 16, 115–125, 2009. Delrieu, G., Boudevillain, B., Nicol, J., Chapon, B., Kirstetter, P.-E., Andrieu, H., and Faure, D.: Bollène 2002 experiment: radar rainfall estimation in the Cevennes-Vivarais region, J. Appl. Meteorol. Clim., 48, 1422–1447, 2009. Delrieu, G., Creutin, J.D., and Andrieu, H.: Simulation of X-band weather radar mountain returns using a digitized terrain model, J. Atmos. Ocean. Tech., 12, 1038–1049, 1995. Faure, D.: Rapport ALICIME RE05002b, Cartographie globale de la visibilité hydrologique du réseau radar métropolitain ARAMIS à l'horizon 2006: Extension à l'ensemble du territoire métropolitain pour le mode d'exploitation passé et actuel des radars, 50~p, 2005. Faure, D.: Rapport ALICIME RE05001, Cartographie globale de la visibilité hydrologique du réseau radar métropolitain ARAMIS à l'horizon 2006 : Mise au point des méthodes de calcul, d'optimisation du protocole de balayage et de combinaison radar-radar, sur la région Sud Est de la France, 27~p, 2006. Météo-France, Direction des Systèmes d'Observation: Documents sur la qualité de mesure du radar ARAMIS de Lyon Satolas, et cartographie des échos fixes et des masques observés sur les images de ce radar, 3~1p, 2001. Michelson, D., Einfalt, T., Holleman, I., Gjertsen, U., Friedrich, K., Haase, G., Lindskog, M., and Jurczyk, A.: Weather radar data quality in Europe quality control and characterisation. Review, COST Action 717 – Use of radar observations in hydrological and NWP models, Luxembourg, 87~p, 2005. Pellarin, T : Visibilité hydrologique de radars météorologiques opérant en régions montagneuses: application au bassin versant de l'Ardèche, PhD of the Joseph Fourier University, Grenoble I, 253~p, 2001. Pellarin, T., Delrieu, G., Saulnier, G.M., Andrieu, H., Vignal, B., and Creutin, J.D.: Hydrologic visibility of weather radar systems operating in a mountainous region: case study for the Ardèche catchment (France), J. Hydrometeor., 3, 539–555, 2002. Renard, F. and Chapon, P.-M.: Evaluation de la vulnérabilité urbaine pour une approche globale du risque: utilisation d'une méthode d'aide à la décision et application à l'agglomération lyonnaise. L'Espace géographique, n&deg;1, 35–50, 2010. Renard, F. and Comby, J.: Caractérisation de l'aléa pluviométrique en milieu urbain à partir d'interpolations spatiales: le cas du Grand Lyon, Climatologie, 4, 131–144, 2007.