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<br />001253 <br /> <br />. <br /> <br />. <br /> <br />Mav 1. 2001 Preliminarv 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 2001 <br /> <br />Change From Last <br />Month's Forecast <br />April-Julv Wat Yr 2001 <br /> <br />Maximum (2) <br /> <br />8,100 <br /> <br />Mean <br /> <br />5,800 * <br /> <br />Minimum (2) <br /> <br />3.600 <br /> <br />11.490 <br /> <br />-0.464 <br /> <br />-0,500 <br /> <br />8,790 - <br /> <br />-0.064 <br />0,236 <br /> <br />6.190 <br /> <br />0,000 <br />0,300 <br /> <br />* This month's A-J forecast is 75% of the 30-year A-J average shown below. <br />** This month's A-J forecast is 75% 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 />Long-Time Average (1922-2000) <br />30-yr, Average (1961-90) <br />10-yr. Average (1991-2000) <br />Max. of Record <br /> <br />Min, of Record <br /> <br />Last Year (2000) <br /> <br />April-Julv Flow <br /> <br />Water Year Flow <br /> <br />8,018 <br />7,735 <br />7.434 <br />15.404 (1984) <br />1,286 (1977) <br />4,352 <br /> <br />11,869 <br />11724 <br />11 .403 <br />21,873 (1984) <br />3,663 (1977) <br />7,310 <br /> <br />(1) Under conditions of no other Upper Basin reservoirs, <br /> <br />(2) USBR 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 />