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Figure 13. Relationship of the Mar-May. PDO vs. District 32 Jun.-Sep. Basin Avg. Precip. <br />D - Summer Precipitation – Days with 0.10” or greater (May 1-September 15) <br />For ‘growing season’ days the number of days with 0.10” or greater was limited <br />to examining two stations with sufficientdaily data for, Fort Lewis and Cortez. <br />A look at the calculated relationships reveals a couple of interesting items. For <br />Cortez, there was some relationship with the MEI/SOI (El Nino) and the number of ‘wet’ <br />(> 0.10”) days with El Nino years exhibiting a propensity for more days with moisture. <br />Figure 14 <br />An example of this relationship with respect to Cortez can be seen in . El Nino <br />years have a tendency to at least deliver a normal/near normal amount of days in the <br />basin with some scatter in La Nina year. <br />At Fort Lewis, the ENSO relationships were not as clearly apparent as they were <br />in Cortez however, the relationship with the AMO was worth noting as positive years <br />indicating that a normal number of ‘wet’ days reach the average range with a number of <br />notable lack of ‘wet’ days at the station. <br />Given the mixed results with two stations that appear to be in relatively close in <br />proximity both variable might be considered if attempting to make a determination on the <br />potential for ‘wet’ days in the area for spring. Also, a little more analysis might be <br />undertaken at a future date to refine these relationships. <br />22 <br />