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Table 8. Summary of single season Apr.-Jun. Precipitation/HCI Relationships for the Arkansas basin <br />(‘X’ indicates a relatively strong relationship and ’O’ indicates a relatively weak relationship). <br />PDOMEISOINino 3.4 NAOAMO <br />Upper Ark. OO <br />Middle Ark. <br />OO <br />Lower Ark. O <br />C -Summer Precipitation (July-September) – Single Seasonal Totals <br />The one variable that indicated some level of predictability with respect to summer <br />precipitation (total) in this area was the ENSO HCI’s. However, unlike many of these <br />variables where the overall theme of wet-El Nino/dry - La Nina is actually reversed in <br />this situation where La Nina (either MEI or SOI) has a wet tendency. However, this <br />relationship is not overly robust and use of this for planning purposes maybe considered <br />tentative. <br />D - Summer Precipitation – Days with 0.10” or greater (May 1-September 30) <br />There were two stations analyzed to see if/how HCI may affect the number of <br />‘wet’ days across the area in Pueblo and La Junta. For Pueblo there was quite a notable <br />Figure 19 <br />difference in the correlation with the NAO as shown in . <br />Figure 19. Relationship between days with 0.10” or greater for May to September at Pueblo with <br />respect to the Dec.-Apr. NAO value. <br />30 <br />