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While improved predictability and forecast skill are critical to hydrometeorologic applications, one can unequivocally say that translation of these forecast products to the end-users pose a similar challenge to the researchers as system constraints could limit their potential utility. There is a need for reliable forecast over sub-seasonal to seasonal (S2S) time scale among water resources practitioners as this is the period over which crucial operational decisions-short term (15-30 days) water release, water allocation during droughts, alteration in hydropower generation to meet peak energy demand, maintaining end-of-the-season target storage-must be taken. We investigate the applicability of S2S climate forecast for multi-purpose multi-reservoir system analysis using probabilistic streamflow forecasts developed for the Tennessee Valley Authority (TVA) system. This study is carried out in two steps: first, S2S …