Opening Session.- Introductory speech.- Welcome address.- Introductory lecture/Some aspects of modern radiometeorology.- I Group / Air-Sea Interaction and Ducting: Meteorological and Radiometeorological Aspects.- The physical processes of air-sea interactions: a review.- Present state of knowledge on evaporation from the sea and numerical analysis/forecasting of water vapor pressure in the surface layers of the air.- Preliminary observation of the evaporation duct in the I.M.S.T. air-sea wind tunnel.- The dynamics of water vapor flux in the marine boundary layer.- The structure of the atmospheric boundary layer at sea.- About the need of a standard technique to compute atmospheric refractive index from radiosonde data.- Determination of the wind stratification by scatter propagation methods on 7 and 16 GHz.- Turbulent transport and refractive index structure immediately above the air-sea interface.- II Group / Air-Sea Interaction and Ducting: Radiopropagation Aspects.- The structure of moisture and temperature profiles in the near-surface layers, their variability and effects on radar propagation as demonstrated with ray tracing techniques.- State and limits of prediction methods of radar wave propagation conditions over sea.- Characteristics and applications of line- of-sight duct propagation.- Propagation theory for the evaporation duct.- Oceanic duct and its effects on microwave propagation in the Mediterranean Sea.- Transmission of millimeter radio waves in over water ducts.- Diffraction of radio waves by terrain obstacles in radio ducts.- Interference lobes pattern connected to a ground based radar duct.- The Occurrence of very high field strengths at beyond the horizon propagation over sea in the frequency range 60-5000 MHZ.- III Group / Atmospheric Influence on Radio Propagation Above 10 GHz: Communication Aspects.- Communications requirements at frequencies above 10 GHz and their correlation with propagation aspects.- Aspects in using frequencies bands above 10 GHz for satellite communication systems.- IV Group / Atmospheric Influence on Radio Propagation Above 10 GHz: E.M. Propagation Phenomena and Results.- Attenuation by rainfall in the sub-millimetre wave region.- Recent studies of visibility and atmospheric attenuation at optical wavelengths.- Some recent lidar experiments on particle scattering in the lower troposphere.- Radiometry, the structure of atmospheric spectrum lines, and related experiments.- Depolarization phenomena on electromagnetic waves through rain.- Analysis of the influence of the various parameters on the attenuation-rain rate relation.- Quantitative analysis of precipitations through radar techniques.- Reports of Working Groups.- Group A: Some general comments on the exchange and stability processes in the surface layer.- Group B: Concerning evaporation and intermittency.