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25 ème Colloque de l’Association Internationale de Climatologie, Grenoble 2012López-Moreno J.I., Vicente-Serrano S.M., Morán-Tejeda E., Lorenzo-Lacruz J., Kenawy A., Beniston M.,2011 : Effects of the North Atlantic Oscillation (NAO) on combined temperature and precipitation winter modesin the Mediterranean mountains: Observed relationship sand projections for the 21st century. Global andPlanetary Change, 77, 62-76.McKee T.B., Doesken N.J., Kleist J., 1993 : The relationship of drought frequency and duration to time scales,Proceedings of the 8th Conference on Applied Climatology, 17-22 January 1993, Anaheim, California, 179-184.Nouaceur Z., 2010 : Evaluation des changements climatiques au Maghreb : Etude du cas du nord-est algérien.Actes du XXIII ème colloque de l’Association Internationale de Climatologie, 463-468.Stour L., Agoumi A., 2008 : Sécheresse climatique au Maroc durant les dernières décennies. Hydroécologieappliquée, 16, 215-232Saadaoui M., Ben Sakka M., 2007 : Pluviométrie en Méditerranée occidentale et Oscillation Nord-Atlantique(NAO). Actes du XX ème colloque de l’Association Internationale de Climatologie, 501-507.80
25 ème Colloque de l’Association Internationale de Climatologie, Grenoble 2012Fernand AVILACHUTES DE GRÊLE ET PRÉVENTION DANS LE SUDDU BASSIN AQUITAIN (FRANCE)Docteur de l’Université de Pau et des pays de l’Adour, 20 rue Jacques Prévert 40800 Aire-sur-l’Adour, France.fernand2_avila@yahoo.frRésumé : Le sud du Bassin Aquitain est constitué de collines et de vallées en éventails, provenant de l’érosiondes Pyrénées. Les observations des postes de Maumusson (collines du Gers) et Aire-sur-l’Adour (large valléede l’Adour) montre que les chutes de grêle nombreuses dans le secteur des collines que dans la vallée del’Adour, confirmant les travaux de Vinet (2000). Les situations sont favorables à la grêle quand s’établit un fluxde SW et que la température nocturne est élevée les jours qui précédent la chute de grêle. Il est cependantpossible de limiter artificiellement la taille des grêlons en introduisant dans le nuage des noyaux d’iodure grâceà des générateurs, ce qui diminue sensiblement la nuisance des orages de grêle. Assurée par des bénévoles, lalutte contre les orages de grêle est désormais efficace.Mots-clés : Orages de grêle, collines du Gers, vallée de l’Adour, prévention.Abstract: Hail storms and prevention in South of the Aquitaine basin (France).The South of the Aquitaine basin is constituted of fan shaped hills and valleys resulting from Pyrenees erosion.The climatologic station of Maumusson (hills of Gers) noticises that hail thunderstorms are more numerous thanin the valley of Adour, what is confirming the works of Vinet (2000). The situations are favorable to the hailwhen there is a flow of SW and when the night-temperature is warmest than the previous days the fall of hail. Itis however possible to limit artificially the size of hailstones by introducing into the cloud of the cores of iodidethanks to generators, what decreases appreciably the nuisance of the thunderstorms of hail. Held by volunteers,the fight against the thunderstorms of hail is henceforth effective.Keywords: Hail storm, hills of Gers, Adour valley, prevention.IntroductionLe sud du Bassin Aquitain forme un éventail de collines et de vallées ; les postesclimatiques de Maumusson (depuis 1961) et d’Aire-sur-l’Adour (depuis 1970) ne sontdistants que de 15 km en ligne droite. Le poste de Maumusson se trouve dans le secteur descollines du Gers, au SE du poste d’Aire-sur-l’Adour qui est situé sur la rive droite de l’Adour(figure 1).Figure 1 : Croquis de localisation deslieux les plus grêlés et des postesmétéorologiques de Maumusson et Airesur-l’Adour.81
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