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r, , '. o D '''i !"' ') U'U.. n , -7- _ It; is expected that all these stations will show a frequency pattern which describeS precipitation occurrences in a semi-arid o1:llJ1atic region. Such' patterns show a mucjl higher number of cases falling below the arithmetic average than above it. This is certainly to be expeated during the summer months .and probably also prevds during the vinter months in this area. While a very high percentage of the streamflow of the upper Colorado River originates in the State of Colorado. a more complete anaJysis covering an additional ten stations scattered throughout the other three States of Wyoming. Nev Mexico and utah could be accomplished in the SSllle study. STEP NO. 2 Since 1948 the Weather Bureau has currently been entering on punch cards the dail.y climotologiaal observations for about 215 . stations in Colorado. These include regular Weather Bureau Stations and cooperative and volunteer climatological stations throughOllt the state. As of July 1. 1958. ten years of record is now available on punched cards for most of these stationa. In the western slopes of the Colorado Rockies which feed the Uppe:rCo1orado River Basin there are same 30 stationa which have a record of 11 years or more prior to 1948. In addition to the 20 stations listed above for which the greater record has already" been shown. additio1l&l stations which have records that could and should be placed on punch cards are I .Aspen Norwood Northdale Craig Eagle The placing of the daily precipitation (and temperature) records on punched cards for theae stations would constitute the handling of approx:llJlate1y 1100 station years of record. Green Mountain Dam Greystone SUnbeam Wolf Creek Pass . It is partic:ularlyimportant that these cards be considered as a contributary effort toward ult:llJlate more complete analysis of the cl:llJlate of the State of Colorado, and therefore they would have use beyond the partic:ular studies being proposed here. m order to expand the work of ~ching cards for all precipitation stations. particularly relevant to the Upper ColoradO River Basin, selected stations should be added to the record from the three additional states of the Upper Basin.