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<br />II. GENERAL INFORMATION & CONVENTIONS <br /> <br />Seasonal water supply forecasts are released in several monthly (January - May) publications, <br />including the Water Supply Outlook Report of the Colorado Basin River Forecast Center (RFC), <br />National Weather Service. The Outlook Report is issued in three parts for each of the three major <br />river basins in the RFC area of responsibility, the Upper Colorado, Lower Colorado, and the Eastern <br />Great Basin. <br /> <br />Forecasts represent a coordinated effort between the National Weather Service, Soil Conservation <br />Service, U.s. Bureau of Reclamation, U.S. Geological Survey, Salt River Project, and local water <br />district managers. <br /> <br />Forecast period: April 1 through July 31 (most basins). Due to the earlier melt in the Lower <br />Colorado Basin, the forecast period begins sooner and decrements each month to include only the <br />future. Specifically, the period shifts from January 1 through May 31 at the beginning of January to <br />April 1 through May 31 at the beginning of April. <br /> <br />Forecast units: thousands of acre-feet (kaf). One acre-foot is equivalent to the volume represented by <br />one acre of area covered one foot deep (43,560 cubic feet or approximately 326,000 gallons). <br /> <br />30 year averages: arithmetic average of values over the 1961-90 period. <br /> <br />30 year medians: median of values over the 1961-90 period. The median, or middle value, is used in <br />lieu of the average in the Lower Colorado Basin. With respect to the median, one half of the values <br />are above that level and one half of them are below it. <br /> <br />Note: Data used in this report are provisional and subject to revision. <br /> <br />For more information, or to be included on the mailing list, please contact: <br /> <br />Colorado Basin River Forecast Center, National Weather Service <br />2242 W. North Temple; Salt Lake City, UT 84116; (801)-524-5130 <br /> <br />4 <br />