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<br />001342 <br /> <br />. <br /> <br />.l <br /> <br />. <br /> <br />AUQust 29. 2002 Forecast of Colorado River Flow into <br />Lake Powell (1) (Million Acre-feet) <br /> <br />USBR and National Weather Service <br />April-Julv Water Year 2002 <br /> <br />Change From Last <br />Month's Observed <br />April-Julv Wat Yr 2002 <br /> <br />Maximum (2) <br /> <br />1.115 <br /> <br />Mean <br /> <br />1.115 . <br />1.115 <br /> <br />Minimum (2) <br /> <br />3.243 <br /> <br />-0.730 <br /> <br />-0.600 <br /> <br />2.943 .. <br /> <br />0.000 <br />0.600 <br /> <br />-0.030 <br />0.670 <br /> <br />2.643 <br /> <br />. This month's A-J observed is 14 % of the 3D-year A-J average shown below. <br />*' This month's WY forecast is 24 % of the 3D-year W- Y average shown below. <br /> <br />Comoarison with past records <br />of Colorado River <br />inflow into Lake Powell <br />(at Lee Ferry prior to 1962) <br /> <br />Long-Time Average (1922-2001) <br />30-yr. Average (1961-90) <br />10-yr. Average (1992-2001) <br />Max. of Record <br />Min. of Record <br /> <br />Last Year (2001) <br /> <br />April-Julv Flow <br /> <br />Water Year Flow <br /> <br />8.018 <br />7.735 <br />7.672 <br />15.404 (1984) <br />1.286 (1977) <br />4.301 <br /> <br />11.869 <br />11.724 <br />11.739 <br />21.873 (1984) <br />3.663 (1977) <br />6.955 <br /> <br />(1) Under conditions of no other Upper Basin reservoirs. <br /> <br />(2) USSR and NWS forecasts indicate the probability of 19 chances out of <br />20 that the actual flow will not exceed the maximum value, and will not be <br />less than the minimum value. <br /> <br />-5- <br />