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<br />C C" .' ~ ::l <br />U_,-.e.. __' <br /> <br />MErEOROLOGICAL STUDIES <br /> <br />The Huntington Canyon Generating Plantsite is far removed from the <br /> <br />places in Utah and Colorado where observations of upper air winds and <br /> <br />temperatures are regularly made by the National Weather Service. Inter- <br /> <br />vening high mountain ranges and local canyon topography combine with <br /> <br />distance to prevent reliable extrapolation from available, long-term <br /> <br />upper air records in inferring the diffusional behavior of the atmos- <br /> <br />phere in the vicinity of the plantsite. Local observations in combina- <br /> <br />tion with general knowledge of the effects of canyon topography on atmos- <br /> <br />pheric circulation offer the best available basis for prediction of plume <br /> <br />dispersion from the Huntington Canyon site. <br /> <br />In recognition of this, Utah Power & Light Company contracted with <br /> <br />North American Weather Consultants (NAWC) in 1969 to carry out a meteor- <br /> <br />ological study of the prop03ed plantsite. <br /> <br />On-Site Meteorological Program <br /> <br />In mid-December 1969, NAWC installed a meteorological station at the <br /> <br />proposed plantsite. Continuous recordings of surface temperature and <br /> <br />humidity and winds at the 20-foot level are made by the instruments <br /> <br />originally installed. In March 1970, the meteorological program was <br /> <br />expanded to include twice weekly soundings of the vertical structure of <br /> <br />temperature and humidity. These are made by flying an instrumented air- <br /> <br />craft between elevations of about 6,500 feet and 11,000 feet in Hunting- <br /> <br />ton Canyon. For flight safety reasons, the focal point of the sounding <br /> <br />flights is approximately 3 miles southeast of the plantsite. <br /> <br />10 <br />