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This paper presents a prototype of the collaborative problem solving environment (PSE) for flood forecasting. Flood forecasting is a complex problem that requires cooperation of many scientists in different areas. To enable this cooperation in a manner comfortable to hydrometeorological experts, a part of the CrossGrid project is aimed towards developing a PSE, whose prototype is described here. The PSE consists of a cascade of simulation models, a storage system for computed and measured data and other used datasets, a Web‐based portal with collaboration tools and a powerful computation facility. The whole system is tied together by grid technology and is used to support a virtual organization of experts, developers and users.