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Snow is a complex and short-lived sediment with many effects on its surroundings. The emphasis will be on the internal processes and external interactions of snow with natural and man-made systems. A better understanding of the interfacial properties of snow is required to define exchange mechanisms that drive chemical, ecological and hydrological processes in many regions of the world. The snow interface also determines how roads, buildings, ski-pistes and other man-made systems are designed and used. How atmospheric interactions contribute to the formation of snow avalanches and other cold-region natural hazards will be a further conference topic, as will be snow in motion and modelling snow under static and dynamic loadings, since these are key issues in engineering problems. We hope to bring together researchers working on the physical properties of snow with scientists working on ecological, hydrological and engineering problems in which the understanding snow processes plays a key role. Snow will be examined at all scales - from the microscale of snow structure to the megascale of remote sensing. The conference theme is to pay homage to the International Polar Year 2007–2008. TOPICS: The suggested topics include: 1. Observing and modelling of snow at different scales: a) Snow cover distribution and variability b) Snow and its stratigraphy c) Snow microstructure d) Scaling issues 2. Snow as a component of climate and of landscape: a) Snow-atmosphere interactions b) Snow-ground interaction c) Perennial snow cover in the Arctic, Antarctic and mountains 3. Snow physics and -chemistry a) Snow metamorphism- heat and mass transfer b) Snow chemistry and metamorphism c) Heat and mass transfer in snow d) Physical and mechanical properties of snows 4. Snow in motion a) Snow avalanches b) Snow drift c) Snow tribology 5. Snow engineering a) Avalanche engineering and warning b) Architecture and constructions in snowy regions 6. Snow and biosphere a) V egetation b) Wildlife