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<br /> <br />001407 <br /> <br />nI.4 <br /> <br />Correlation lIi th hydrologic parameters <br /> <br />Correlations of monthly average temperature lIith other hydrologic <br />parameters,: such as snow melt, may be misleading. Thus, a near-no~l <br />month that tl.ncludes a short period of abnomally high temperature msy <br />be much more critical than a month in which all the daily temperatures <br />are slight~ or lJIOderately above average. Also, the arbitr$rY period <br />of a month is not necessarily the best interval fo.r hydrologiC correlatioIl.s. <br />Temperature; expressed as accUlllUlated degree~days may be IliUch easier to <br />correlate than temperature expressed as an average over successive periods <br />of fixed duration, however long. <br /> <br />Upper-air temperatures <br /> <br />The great utility of upper-air temperature in hydrologic studies is <br />overlooked POllllllonly. For example, as reported :from radiosonde observatiol!,s, <br />such temperatJU"es may s.erve as a better index to the altitude at llhich sntllr <br />melts than pan. any temperature measured on the lan.d surfaCe. This is tI'llB <br />especially ;in mountainous terrane, as has been implied. In addition, upper.. <br />air temper<<:tures Diay be predicted lIith greater accuracy than those for <br />stations on the land surface. <br /> <br />. <br />