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Last modified
7/28/2009 2:34:59 PM
Creation date
3/5/2008 2:27:50 PM
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Weather Modification
Title
Weather Modification Design Study for Streamflow Augmentation in the Northern Sierra Nevada - Volume 1
Prepared For
US Dept. of Interior
Prepared By
MBAssociates
Date
7/1/1976
State
CA
Weather Modification - Doc Type
Report
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<br />2.0 MACROSCALE AND MESOSCALE <br />CLIMATOLOGY OF THE SIERRA NEVADA <br /> <br />2. 1 <br /> <br />Synoptic Conditions in the Sierra Nevada <br /> <br />.ll <br /> <br />j <br /> <br />This section summarizes preliminary findings of a s"tudy of <br />the meteorological environment for weather modification activities along <br />the windward slope of the Central Sierra Nevada. The principal sources of <br />information for this study have been the data and analysis archives and <br />reports of the CENSARE project conducted by Atmospheric Water Resources <br />Research (A WRR), California State University in Fresno, from 1968 to <br />1973. These archives represent the most complete collection of such data <br />and analyses for the Sierra Nevada. In addition to CENSARE data, these <br />archives include data from the Pacific Gas and Electric Company (PG&E) <br />Lake Almanor Project, the Sacramento Municipal Untility District (SMUD) <br />Project (along the South Fork of the American River), and considerable <br />National Weather Service (NWS) data (including radar data from the WSR-57 <br />radar at Sacramento). This information has been augmented with more <br />recentrawinsonde data from Lake Almanor, Fresh Pond, and Angels Camp <br />(in the Sierra Nevada); the hourly radar logs from Sacramento WSR-57 <br />radar; and reports by Aerometric Research, Inc. (ARI) and the Desert <br />Research Institute (DRI). The data have been analyzed with respect to the <br />insight gained from five years of observation and analysis of winter storms <br />over Central California. <br /> <br />'. <br /> <br />. <br /> <br />Physical and dynamic relationships among the various <br />parameters have been used to develop a systematic and, hopefully, com- <br />prehensive concept of conditions conducive to precipitation in the Sierras. <br />Relationships found in the data set were subjected to the tests of physical <br />reasonableness, and theoretical hypotheses were checked for applicability <br />to the observed storm conditions in the Central Sierra Nevada. Information <br />from the northern extreme of the area under consideration was compared <br />with data acquired at the southern end to determine the applicability of <br />conclusions drawn across the entire area. <br /> <br />It' <br /> <br />The basic findings were that winter precipitation in the Sierra <br />Nevada occurs predominantly in the form of bands of convective precipitation <br />. associated with, and primarily ahead of, polar cold frontal systems. These <br /> <br />5 <br />
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