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The Anelfa (National Association for the Study and Fight against Atmospheric Scourges) is a French association under the 1901 Collective Protection Act in five regions for a total of 18 departments (South-East, South-West, Charente and Loire Valley) and an area of ​​80 000 km² protected by 800 generators. Founded in 1951 on the initiative of a group of farmers, agronomists, physicists and elected officials, its objective is the development of scientific research in the field of cloud physics and the development of a method of treating thunderstorms to reduce their damage. It works with Météo France and Keraunos, who issue an alert four hours before hail risk.