1. Impacts of Climate Change on Water Resources in Idaho Prepared by Zion Klos PhD Student, College of Natural Resources zion@uidaho.edu 920-883-8617 …feel free to e-mail or call me with questions!

2. Idaho’s climate is changing… NCDC

3. Outline Observed (historic) and/or future predictions for changes in: – Precipitation – Snowpack – Streamflow – Stream temperature – Drought

4. Observed Precipitation Changes NCDC

5. Precipitation Intensity Analysis by Troy Magney

6. Precipitation: Future Predictions Precipitation: 2090 - 2099 vs. 1990 - 1999 Salathé Jr, E P, R Steed, C F Mass, and P H Zahn. "A High-Resolution Climate Model for the US Pacific Northwest: Mesoscale Feedbacks and Local Responses to Climate Change." Journal of Climate 21, no. 21 (2008): doi:10.1175/2008JCLI2090.1.

7. Outline Observed (historic) and/or future predictions for changes in: – Precipitation – Snowpack – Streamflow – Stream temperature – Drought

8. Observed Snowpack Changes NCDC

9. April 1 st Snowpack 1950-1997 Mote et al., 2005. Declining mountain snowpack in western N. America. Bull. Am. Met. Soc. = decrease = increase

10. Benton Spring Snow Course elev. 1500 m (4920 ft) Analysis by Ryan Niemeyer

11. Future Predictions for Snow vs. Rain

13. Outline Observed (historic) and/or future predictions for changes in: – Precipitation – Snowpack – Streamflow – Stream temperature – Drought

14. Statewide Streamflow Trends Source of Funding State/Federal COOP – 9 Corp of Engineers – 6 USGS NSIP – 4 Other Funding – 6 Discontinued in FY05 – 1 Unregulated streams with at least 40 years of continuous stream discharge information - 25 stations (as of FY06) Courtesy of Greg Clark (USGS)

15. USGS Statewide Streamflow Trends

16. Onset of Streamflow Stewart, I T, D R Cayan, and M D Dettinger. "Changes Toward Earlier Streamflow Timing Across Western North America." Journal of Climate 18, no. 8 (2005): 1136-1155.

17. Midpoint of Annual Streamflow Runoff Earlier by 10 days or more (2 sites) Earlier by 0-4 days (18 sites) Earlier by 5-9 days (6 sites) Based on average pre- and post-1980 data Courtesy of Greg Clark (USGS)

18. Outline Observed (historic) and/or future predictions for changes in: – Precipitation – Snowpack – Streamflow – Stream temperature – Drought

19. Analysis by Stephen Gillis Stream Temperature

20. Outline Observed (historic) and/or future predictions for changes in: – Precipitation – Snowpack – Streamflow – Stream temperature – Drought

21. Drought: conceptualized through the Climatic Water Balance

22. Anyways, hope you’ll find this information useful! Also, apologies if it’s too much doom and gloom… But hey, who doesn't love some nice, warm weather!