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The peculiar physical properties of snow(like albedo,thermal inertia and conductivity)differ significantly from physical properties of other Earths surfaces like soil or canopy.For this reason,a complete model for studying momentum,heat and water vapour exchange processes at the atmosphere-soil-vegetation interface must take into account snow processes.In this talk,the main outline of the scheme used in the University of Torino model of land Processes Interaction with Atmosphere(UTOPIA)will be presented.The scheme calculates the energy balance of the snow layer determining water equivalent of the snow mass and its inner liquid water content.Snow precipitation,if not observed,is parameterized from rainfall.Snow albedo,density and coverage are calculated using relations derived from observational evidences.