This PDF file includes:

• Fig. S1. Observed October-May changes across the northeastern Pacific.
• Fig. S2. Observed October-May changes in zonal GPH gradient over the northeastern Pacific.
• Fig. S3. Trends in California extreme dry patterns.
• Fig. S4. Trends in California extreme wet patterns.
• Fig. S5. Trends in California extreme warm patterns.
• Fig. S6. Trends in California extreme cool patterns.
• Fig. S7. Change in frequency of high-correlation years using GPH.
• Fig. S8. A comprehensive summary of extreme pattern trend results for analysis using linearly detrended 500-mb GPH data (columns labeled “DT”) and using non-detrended GPH data (columns labeled “NDT”).
• Fig. S9. Time series of pattern correlation between GPH pattern in each specific year of interest and all other years using linearly detrended GPH data.
• Fig. S10. Observed trends in GPH, precipitation, and temperature.

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