The work of the first author was supported jointly by the Commission of the European Communities, DG XII, Environment and Climate Program, Climatology and Natural Hazards Unit Contract ENV4-CT96-0290, and by the Italian National Research Council Grant 93.02975.PF42. The second and third authors gratefully acknowledge support of the U.S. Army Research Office Grant P-34855-GS-YIP. The authors thank Dr. Herve Andrieu (Laboratoire Central des Points et Chaussees, Division Eau, France) and Dr. Fred Ogden (University of Connecticut) for their comments and discussions, and Dr. Frederic Fabry (McGill University Radar Laboratory, Canada) for providing the brightband height data.
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