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<br />ABOUT THE GUIDE: <br /> <br />The River Forecast Center (RFC) of the National Weather Service, along with <br />its fellow agencies, forecasts natural or unimpaired runoff volumes; that <br />is, observed flows adjusted for upstream water management. This <br />publication, the Guide to Water Supply Forecasting, is meant to assist users <br />in interpreting that forecast effort by unambiguously detailing exactly what <br />adjustments to flow are used and how large those values typically are. The <br />following pages consist of alphabetized and numbered lists of forecast and <br />adjustment points. By cross referencing the two, it is possible to <br />determine which adjustments were applied to a given site. Immediately <br />preceding the lists is a text and visual interpretation of an example entry. <br /> <br />With regard to the magnitude of values, monthly averages are shown that <br />reflect the new 30 year (1961-90) period. In the Lower ~olorado Basin <br />(below Lake Powell), medians are thought to better represent central <br />tendency and are used in lieu of arithmetic averages. <br /> <br />Following the lists is a survey of forecast point interest that will assist <br />the River Forecast Center (RFC) and fellow agencies in focusing their <br />resources. Your help on this matter is greatly appreciated. <br /> <br /> TABLE OF CONTENTS <br /> pg(s) <br />I. INTRODUCTION . . . . . . . . . . 3 <br />II. GENERAL INFORMATION & <br /> CONVENTIONS . . . . . . . . . 4 <br />III. EXAMPLE ENTRY . . . . . . . . . 5 <br />IV. ADJUSTMENTS CAN ADD UP . . . . . 6-7 <br />V. FORECAST POINTS . . . . . . . . 8-19 <br />VI. ADJUSTMENTS to FLOW . . . . . . 20-28 <br />Addendum: USER SURVEY <br /> <br />2 <br />