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<br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t, <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br /> <br />1400 to 2200 MST, with widespread snow shower activity over the area. The 700-mb <br />temperature was about -7 C. Several inches of snow fell in most areas, with up to OS' of water <br />equi\'alent. <br /> <br />A strong stoml system centered near Arizona brought snow into portions of west and <br />southwest Colorado on February 21 (litIS). Some seeding was conducted during the afternoon <br />and evening under southwest flow aloft. Snowfall was substantial in some areas. with portions <br />of the target area receiving as much as 1" of water equivalent. Smaller lotals accumulated in <br />most areas. with generally about 0.25 - 0.50" in the main northern portion of the target area. <br /> <br />Another strong stann system (#16) moved into the Four Comers states on February 27- <br />28. bringing heavy snow to portions of Colorado. The San Juan mountains of southwest <br />Colorado were hardest hit. with several feet of snow accumulation containing up to 3"+ of water <br />content occurring there. Southern portions of the Gunnison Basin benefited at least somewhat <br />from this stonn event. while northern portions of the basin received little snow accumulation. <br />Cloud seeding began on the evening of February 27. using sites appropriate for southerly flow <br />aloft. Most seeding ended around midday on February 28. <br /> <br />:\Iarch 200~ <br /> <br />~1arch was an abnornlally wann and dry month in Colorado. with significant mountain <br />snowmelt and runoff beginning around the middle of the month. High pressure dominated the <br />weather pattern. bringing record waml weather during the middle and latter parts of March. <br />Figure 3.4 is a plot of the maximum and minimum temperatures. along with nonnal values. for <br />the ='RCS site at Butte. near the center of the target at an elevation of 10. 160'. This temperature <br />plot for the ~arch I-April 15 period shows these wann temperatures. with many days exceeding <br />500 F during this period. a rare occurrence for such an extended period of time this early in the <br />season. Only about one-third of the nonnal March precipitation fell in the Gunnison Basin. <br />Figure 3.5 is a plot similar to 3.4. but for precipitation at Butte instead of temperature. This <br /> <br />2~ <br />