Ground Seeding Hail Prevention Experiment in France
The project of reducing damaging hailfalls by silver iodide seeding in the boundary layer before and during the growth of thunderstorms is still increasing in the south part of France, north of the Pyrenees. The seeding network consists now of 450 ground vortex generators in an area of about 7 millions hectares. The scientific contribution of this project concerns the climatology and the dynamics of severe hailstorms, their forecasting, and the generation and measurement of artificial ice nuclei in the atmosphere. The economical impact is evaluated with double-mass curves of loss-to-risk insurance ratios in seeded and control areas.