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Historical PerspectivDs on Colorado Drought Page 20 In general, EI Ninos arc typically associated with conditions of higher moisture over Colorado while La Ninas have been typically been associated .....ith drier than average conditions over the state during winter. These relationships tend to be more robust in the southern regions orlhe state. However, it should be noted that the extreme, nearly statewide drought during the winter of 2001-2002 ENSO was not in a conclusive EI Nino or La Nina state. Regardless of the state of EN SO Of other climatic factors that are currently being examined, either a lack of Pacific moisture. a lack of storms with the jet stream (in strength or numbers), or both can be linked to periods of wintertime drought. In La Nina years, the Pacific storm track tends 10 migrate further 10 the north and is already in a less-than-idcal position 10 bring an adequate amount of storms in terms of numbers and intensity for precipitation generation. La Nina years have had a greater tendency to produce drier-than-normal springs aeross the Front Range. Impacts of El Nino and La Nina on monthly precipitation at Denver and Grand Junction can be seen in Figures 17 and 18. '..... 61..<;11)_. El ~lt\O_. ;,~,,"~~ i.:..~~~:oi~ ........0 --...-. ,,-"'<.0.'" ,..... 61-90_. l.~l"'_ ...~""~. ..01<#,.. ........0 ..........._1 ,,_e....- El Nino and La Nina impacts on monthly Denver precipitation recycled content paper Figure 17 HOR Engineering. Inc. Printed on 30% post-consumer rrooc:1plt.tlon H~'t\OMI~. _.Col....-Io t_..,U1P.t , ! l 1 l'rooc:lp.lbtlon L.N,,,.N,nc....... _.C..l....-Io ~1_..,UlP..t i . ! 1