RESULTS:  The calendar day of maximum runoff is shown.  Note it retreats nearly one month in the annual cycle in the next 40-50 years. This is particularly true for rivers fed by snow melt from intermediate elevations such as the Carson River.  Rivers fed by higher elevation snows (American River) show less impact.   Retreats of a few days to a week have been already observed relative to 1970 (not shown) over most of western N. America.  The point is that this retreat is already in progress.
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