1. Coming Attractions from the Washington State Climate Impacts Assessment Lara Whitely Binder Alan Hamlet Marketa McGuire Elsner Climate Impacts Group Center for Science in the Earth System Center for Science in the Earth System University of Washington October 2, 2008 CIG Climate and Water Fall Forecast Meeting Climate science in the public interest

3. HumanHealth Human Health Agriculture/Economics Salmon Forest Resources CoastsEnergy Infrastructure Water Resources A comprehensive climate change impacts assessment for Washington State Adaptation

4. Project Domain: WA and the PNW wide range of data available for all the PNW! To assess impacts in water and other sectors, the analysis must include all of the PNW = wide range of data available for all the PNW! Detailed case studies for water supply are being done for the Puget Sound Region and Yakima Basin

5. Reduced snowpack and changes in soil moisture will occur. Declines in April 1 SWE vary between 35%-41% for the 2040s, depending on the emissions scenario. Hydrology and Water Resources

6. ** Preliminary results - subject to change** Average annual SWE in the Yakima watershed above Parker is projected to be 31-68% of historic levels by the 2040s for two “middle of the road” scenarios Winter streamflows increase as basin shifts to rain-dominant basin

7. Increasing thermal stress likely to become most problematic for salmon in the interior Columbia River Basin. In Western WA salmon, increases in the magnitude of extreme high/low flows likely to be most problematic Projected Maximum Weekly Average Water Temperatures – 2040s 49% of stations exceed the 21ºC (70°F) water quality criteria (changes relative to 2001-2007) Salmon

8. Longer growing seasons is projected, especially for summer crops. Range for the 2040s: +10 days for Franklin/Walla Walla counties to + 27 days for Whatcom County Changes in spring and summer aridity projected in all agriculturally important counties Diseases will generally become more problematic over the next century, especially as a result of warmer temperatures. Agriculture

9. Heating degree days will continue to dominate in the 2020s and 2040s, but cooling degree days become a much more important factor in eastern WA as the region warms. Energy

10. Improved Access to Hydrologic Scenarios in the Columbia River Basin Answers to FAQ regarding WA 2860 from the Department of Ecology website: http://www.ecy.wa.gov/pubs/0611014.pdf Goals: Create a comprehensive, up-to-date, self-consistent, publicly available hydrologic database to support long- range planning Construct end-to-end process to allow updates of the database when new climate change scenarios are available

11. Regional Study Partners WA State Department of Ecology Bonneville Power Administration Northwest Power and Conservation Council State of Oregon Province of British Columbia (BC Hydro and The Ministry of Environment)

12. Survey Participant Agency/Organization Affiliation 178 participants State and Federal employees make up 60% of the participants

13. Survey Participant Management Areas Water supply, ISF management, & hydropower production dominant management areas In addition to entire PNW, Snake, Yakima, and Okanogan regions were identified as important

14. Snake River Basin Willamette River Basin Mainstem Columbia River Basin Yakima River Basin Upper Columbia River Basin Kootenai River Basin 271 Sites Salmon River Basin

15. Survey Response – Data Needs Fine resolution Daily time step Spatial maps of data anomalies/patterns of mean changes Excel or ASCII (text) data format Web or ftp data transfer Data Variable 271 Sites Naturalized streamflow Regulated streamflow Changes in flood frequency (100 yr flood) Changes in low flow (7Q10) Drought frequency, severity, duration analysis Analysis of streamflow timing shifts Gridded Data (16th degree) Min/Max temperature Precipitation Soil Moisture Potential evapotranspiration Snowpack (SWE, depth) Date of peak SWE Date of 90% SWE melt Fraction of precipitation as rain

17. Sample Preliminary Spatial Maps Based on Delta Method Experiments