Abstract: No abstract available.

Abstract: observations of waterspouts and tornadoes suggest some influence of surface roughness on these phenomena. In a laboratory model of a tornado-like vortex, this influence is measured in terms of tangential and vertical ...

Abstract: tract

Abstract: A nonrandomized weather modification project, hail prevention by seeding from the ground, has been run since 1952 in a large area of southwestern France. From the beginning of the experiment, the parameter proposed to ...

Abstract: In the context of an experiment of hail prevention in the Aquitaine region, 12 869 reports of damaging hail have been compiled during 29 years in an area of 88 980 km2. These observations, together with crop insurance data, ...

Abstract: No abstract available.

Abstract: The large-scale hail prevention program operated by the Association Nationale d?Etude et de Lutte contre les Fléaux Atmosphériques in southwestern France combines the seeding of hail clouds by a network of silver iodide ...

Abstract: In the period 1680?1988, 107 significant tornadoes in the Fujita scale categories F2?F5 have occurred in France. These include 49 such events in the historical period 1680?1959, and 58 events in the modem period 1960?1988. ...

Abstract: Observations of vortices of various types produced in a large thermal plume are described. The apparatus used to generate the plume is the Météotron, an array of 105 fuel oil burners with a total heat output of approximately ...