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A wide variety of climatic factors influence the occurrence of debris flows, which include mudflows and lahars (see Chapter 2). Climatic factors are an important subject for a better understanding of hydrologic response of soils and of how global climate change can influence debris-flow activity. In addition, climatic factors are essential for developing debris-flow warning systems. Climatic factors have extreme spatial and temporal variability. Rapid infiltration of prolonged intense rainfall, causing soil saturation and a temporary increase in pore-water pressure, is generally believed to be the mechanism by which most shallow landslides, and more specifically debris flows, are generated during rainstorms (Iverson, 2000). This chapter focuses on the primary and secondary climatic factors that influence the occurrence of debris flows. Primary climatic influences are those that directly trigger debris flows, such as intense …