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Erika Wise–PI. This project will use the tools of synoptic climatology and seasonally resolved tree-ring data (based on earlywood and latewood widths and stable isotope composition) and weekly precipitation isotope sampling at co-located sites to reconstruct storm-track position and moisture delivery pathways to the Pacific Northwest in order to: (1) develop a long-term record of storm track using stable isotope dendroclimatology; (2) determine the seasonal signal embedded within the tree rings; (3) delineate controls on spatial drought patterns through time in the Pacific Northwest; and (4) evaluate implications for future climate change. This approach will allow us to characterize the range of variability in the precipitation-delivery system, investigate seasonality issues in proxy data, and delineate the possible impacts of future projected atmospheric changes.