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<br />" <br /> <br />001271 .. <br /> <br />.. <br /> <br />AUQust 1, 2001 Preliminarv Forecast of Colorado River Flow into <br />Lake Powell (1) (Million Acre-feet) <br /> <br /> Change From Last <br /> USSR and National Weather Service Month's Forecast <br /> April-July Water Year 2001 April-July Wat Yr 2001 <br />Maximum (2) 4.300 7.254 -0.600 -0.971 <br />Mean 4.300 . 6.954 .. 0.000 -0.271 <br />Minimum (2) 4.300 6.654 0.600 0.429 <br /> <br />. This month's A-J forecast is 56% of the 30-year A-J average shown below. <br />.. This month's A-J forecast is 59% of the 30-year W-Y average shown below. <br /> <br />Comparison with past records <br />of Colorado River <br />inflow into Lake Powell <br />(at Lee Ferry prior to 1962) <br /> <br /> April-Julv Flow Water Year Flow <br />Long-Time Average (1922-2000) 8.018 11.869 <br />30-yr. Average (1961-90) 7.735 11.724 <br />10-yr. Average (1991-2000) 7.434 11 .403 <br />Max. of Record 15.404 (1984) 21.873 (1984) <br />Min. of Record 1.286 (1977) 3.663 (1977) <br />Last Year (2000) 4.352 7.310 <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 />