1. Climate Change and Stormwater
Guillaume Mauger
Climate Impacts Group
About CIG: we’re focused on developing information that’s “used by” instead of hypothetically useful.

2. Substantial Warming, Variable Rainfall
2015
(+3.5°F)
(-10%)

3. Warner, Mass, Salathé, J Hydromet, 2014
More Intense
Heavy Rains
Heaviest rain events are projected to become +22% more intense* (range: +5 to +34%) by the 2080s.
Modeling studies
* Top 1% of daily rainfall totals in each year
Warner, Mass, Salathé, J Hydromet, 2014

4. Downscaling relates the large to the small
~ km
(~ mi)
resolution
~6 km
(~4 mi)
Statistical / dynamical

5. Regional Climate Model Projections
Using the Weather Research and Forecasting (WRF) mesoscale model.
Two new regional model simulations,
Hourly Precipitation
Bias-corrected to ~50 weather stations throughout W. WA
CMIP5 Multi Model Ensemble

6. Online Tool
Follow link to Tableau tool and show audience how it works.

7. Percent Changes in Extreme Statistics
Tab #1: Percent Changes
Percent Changes in Extreme Statistics
Follow link to Tableau tool and show audience how it works.
Time Series

8. Intensity Duration Frequency (IDF) Curves
Tab #2: IDF Curves
Intensity Duration Frequency (IDF) Curves
Follow link to Tableau tool and show audience how it works.

9. Tab #3: Validation
Percent bias relative to Observations for both raw and bias-corrected data
Follow link to Tableau tool and show audience how it works.

10. Visualizing the Results
Follow link to Tableau tool and show audience how it works.

11. UW Climate Impacts Group cig.uw.edu gmauger@uw.edu (206) 685-0317
Questions?
UW Climate Impacts Group cig.uw.edu (206)

12. Online Tool
Follow link to Tableau tool and show audience how it works.

13. Global Model Rankings Projections: Domain = PNW
Note: Change is relative to each GCM’s historical, meaning that these changes are not affected by biases.