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<br />8 <br /> <br />Table 1. <br /> <br />Priority Rating System Used in Processing Precipitation <br />Data for the 1951-198D Colorado Average Annual <br />Precipitation Map. <br /> <br /> Data Length <br />Priority Require- of Data Implications for <br />Rating ments Examples Record Adjustments Isohyetal Analysis <br /> (years) <br />1 complete NWS 3D None Isohyets must be <br /> month ly cooperative drawn to fit these <br /> data station data. <br />2 comp 1 ete NWS 25-29 normal ratio method Isohyets must be <br /> monthly cooperative used to fi 11 in drawn to fi t these <br /> data station missing months to data. <br /> to make a complete <br /> 3D-year data set. <br />3 comp 1 ete NWS 15-25 ratio adjustment Isohyets usually <br /> monthly cooperative used to adjust drawn to fit these <br /> data station annual mean to be data. <br /> cons; stent with <br /> complete 3D-year <br /> data sets. <br />4 seasonal SCS 14-30 adjust seasonal used to reposition <br /> or annual snow data to annual. isohyets where two <br /> data course No adjustments for or more data points <br /> record length. suggest change. <br />5 mi seell aneous USFS 5-30 None Used in data sparse <br /> data sources storage areas to check <br /> not a part of gage data positioning of <br /> standard station contours.. <br /> netwo rlt s or Short <br /> short record NWS data <br /> 1 ength data set <br /> <br />. <br />