Synthesizing realistic natural scenes is a challenging and important problem in computer graphics. The challenge stems not only from the complexity and diversity of objects and natural phenomena interacting together, but also from the huge amount of small details that should be modeled to obtain realistic models and physically plausible simulations. Therefore, there is still a need to develop interactive modeling and simulation techniques capable of handling complex synthetic sceneries. This book contains the research presented at the 3rd Eurographics Workshop on Natural Phenomena, which took place September 4, 2007 in Prague, Czech Republic. It builds on work done in recent years including simulating aging and weathering of synthetic objects, plant modeling, ecosystem simulation, gaseous phenomena, and liquid flows. It focuses on non-conscious or inanimate nature like rock, trees, oceans, wind, and meadows.