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Last modified
7/28/2009 2:39:30 PM
Creation date
4/23/2008 11:57:21 AM
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Template:
Weather Modification
Title
Preliminary Analysis of the Hypotheses Used in the Utah Operational Weather Modification Program - Final Report
Date
11/1/1983
Weather Modification - Doc Type
Report
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<br />o!! <br /> <br />limi ted analyses of these important clouds has been complE!ted. These <br /> <br />blanket type orographic clouds, which produced nearly half of the <br /> <br />precipitation, were not seen by the C-band radar and were not probed <br /> <br />by the aircraft. However, it is expected that analyses based on <br /> <br />rawinsonde, radiometer, mountaintop, and precipitation observations <br /> <br />can provide very useful descriptions of these important d.ouds. <br /> <br />2. Area-wide cloud systems produced about 20% of the precipitation <br /> <br />during the field program. The results of the Feburary 8 case study <br /> <br />showed that, for at least this area-wide cloud, the majority of the <br /> <br />observations of supercooled liquid water were limited to the low level, <br /> <br />upwind portions of the cloud. When this saturated air underwent <br /> <br />substantial lifting near the Tushar crest, additional significant <br /> <br />supercooled liquid water could have been produced. This has been <br /> <br />substantiated to some degree by surface measurements. No substantial <br /> <br />amounts of liquid water were observed in the mid and upper level <br /> <br />cloud regions. Thus, at lower levels, these area-wide clouds may <br /> <br />have some characteristics similar to those in the blanket orographic <br /> <br />clouds. It appears that these neutral and stable type, clouds, including <br /> <br />the blanket orographic clouds (around 50%) and the area-,~ide clouds (around <br /> <br />20%) produced about 70% of the precipitation during the field program. <br /> <br />~, <br /> <br />.. <br /> <br />~ <br /> <br />3. Convective clouds produced about one-third of the precipitation <br /> <br />during the field experiment. At least some of these cellular type <br /> <br />clouds had substantial amounts of supercooled liquid water that was <br /> <br />not converted to precipitation over the Tushar Mountains. This was <br /> <br />particularly true during the 28 F'eb 1983 storm system when <br /> <br />substantial liquid water contents were observed and virtually no <br /> <br />precipitation occurred. <br /> <br />.. <br /> <br />iii <br />
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