1. Colorado Plateau Dust-on-Snow: Adapting to The New Normal NWS Coordination Meeting Grand Junction November 22, 2013 Chris Landry CODOS Colorado Dust-on-Snow Program Center for Snow and Avalanche Studies Silverton, CO

2. Event D6-WY2013 In Progress - April 8, 2013 - Silverton

3. Dust Event D8-WY2013 in Progress – 12:00 noon, April 16, 2013

4. Senator Beck Basin, SASP – April 22, 2013 47 gm/m 2 (419 lbs/acre) D8 D7 D6 Dust Storm of 60+ Hours Duration

5. May 9, 2013 – Hoosier Pass CODOS site May 10, 2013 - Berthoud Summit CODOS site D8 D6 Dust-on-Snow Events are Extensive but Not Always Apparent

6. CODOS Event Log – by Season

7. CODOS Event Log – by Month

8. J. Brahney, A.P. Ballantyne, C. Sievers, J.C. Neff. Increasing Ca2+ deposition in the western US: the role of mineral aerosols. Aeolian Research (2013), http://dx.doi.org/10.1016/j.aeolia.2013.04.003 Increasing Ca2+ deposition in the western US: the role of mineral aerosols. The apparent trend is confirmed … dust deposition is increasing

9. http://snowstudies.org/dust/_SurfaceRoughness/index.html Is Dust-Induced Surface Roughness Increasing Sublimation and/or Evaporation, and Reducing Runoff Yields? Yield Effects?

10. Dust-on-snow, when exposed, lowers snow albedo and increases melt energy budget Dust deposition has increased more than 200% in Colorado since the 90’s Water Year 2013 produced two extreme events (D6 April 8 th and D8 April 15-17 th ) Dust-on-snow is causing erratic, “flashy” runoff; spring weather still matters The State Water Plan should address dust-on-snow impacts on Colorado runoff; snowmelt timing and/or rates are significantly departing from ‘median’ hydrograph Dust-on-snow is also affecting snowmelt runoff yields; needs more research The New Normal … May 5, 2013 – looking west from Senator Beck Basin Colorado Plateau is the primary dust source area; soil disturbance and drought are key CSAS’s CODOS program is a stakeholder-driven effort to monitor and adapt to dust; Federal agencies are pursuing improved runoff forecasting and source area science