End users of weather and climate information are rapidly recognizing that a variety of components of engineering practice (ranging from design to operation) cannot rely exclusively on historical observations, such as in the case of precipitation and stream flow. As a consequence, there is a growing desire to understand the implications of uncertainty associated with seasonal to inter-annual forecasts and climate projections to engineering applications. This session is intended to elucidate the challenges facing practicing engineers and hydrologists in an effort to inform the Weather, Water, and Climate Enterprise as to the needs of this important community. The session is being developed with the expressed participation of the American Society of Civil Engineer’s Committee on Adaptation to a Changing Climate.