Sites without modified or natural flow estimates are shown in yellow. Sunday Night: Mostly cloudy with a 20 percent chance of rain. Topographic corrections for precipitation and temperature are carried out by rescaling the data by a fixed factor for each calendar month so that the mean values from 1971 to 2000 match the PRISM climatology for the same period. The dark red lines show the average of the climate change ensemble. The CBCCSP was designed from the outset to support users with a very wide range of technical sophistication and capacity. Casola, J. H., Kay, J. E., Snover, A. K., Norheim, R. A., Binder, L. C. W., & the Climate Impacts Group. Because both these effects increase flood risk in the simulations, the effects are unusually large in these basins (Fig. Thursday Sunny. Impacts of 21st-century climate change on hydrologic extremes in the Pacific Northwest region of North America. Text files (six per figure) providing all the ensemble data used to construct each panel in the figure are also provided on the CBCCSP website. During the study (and afterwards), some stakeholders expressed interest in including less optimistic emissions scenarios (such as SRES A1FI), in order to better understand the implications of a potential worst case scenario. RSUM[Traduit par la rdaction] Le projet de scnarios de changement climatique du bassin du Columbia (CBCCSP) a t conu comme une base de donnes hydrologiques complte pour appuyer les activits de planification, dvaluation des rpercussions et d'adaptation dans la rgion pacifique nordouest menes par une communaut d'utilisateurs diversifie disposant de capacits techniques varies dans une large gamme dchelles spatiales. The CBCCSP provided climate change projections of meteorological drivers and a calibrated VIC implementation in support of the study. One of the major climate change impacts already being seen in the Columbia Basin has been the decreases in winter snowpack, the increase in winter precipitation events, and the resulting shifts in flow regime in the Columbia River and its tributaries. To request a reprint or corporate permissions for this article, please click on the relevant link below: Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?