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Figure 21. Relationship between the September-November. AMO vs. the Apr. - Sept. naturalized <br />stream flow for the Arkansas River at Pueblo Reservoir. <br />F - Single Seasonal Runoff Timing <br />There is insufficient data to exam runoff timing for the Arkansas River as daily flow data <br />is not calculated by the State of Colorado or the U.S. Bureau of Reclamation, to the best <br />of our knowledge. Therefore this task for the Arkansas River basin was not performed. <br />G – Bi-seasonal HCI Relationships <br />October to March Precipitation: <br />Upper Arkansas: <br />In the far upper reaches of the Arkansas the PDO and the AMO were the most <br />notable factors that held some value in multi-seasonal wintertime precipitation. Negative <br />PDO years tend for wetter weather as does positive AMO values (note: that is opposite of <br />many of the basins described in this report.). <br />Middle Arkansas: <br />In the middle reach of the Upper Arkansas the PDO and the MEI were the most <br />notable factors that held some value in multi-seasonal wintertime precipitation. Negative <br />PDO years tend for wetter weather as does positive MEI values (i.e. La Nina leans <br />towards wet weather) <br />32 <br />