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<br />Or" ., < t <br />U.-1..L.. l' <br /> <br />. Beginning in August 1970, the on-site meteorological program has <br /> <br />been further augmented by four data-collection expeditions, held Au- <br /> <br />gust 2-8, 1970, September 23-28, 1970, December 1-8, 1970, and Janu- <br /> <br />ary 25 - February 1, 1971. These field expeditions collected upper <br /> <br />air information using rawinsondes (radio wind sounding equipment), <br /> <br />rapidly rising pilot ballons, and low-lift constant volume balloons <br /> <br />which tend to follow streamlines in moving air. In addition to the <br /> <br />plantsite data, observations were taken in the town of Huntington dur- <br /> <br />ing each of the latter three field expeditions. These included surface <br /> <br />winds, surface temperatures, and winds aloft determined by theodolite <br /> <br />tracking of pilot balloons. <br /> <br />To date,122 aircraft soundings, 42 rawindsonde observations, 224 <br /> <br />pilot balloon observations, and 70 airmass trajectory observations made <br /> <br />with low-lift constant volume balloons have been taken in addition to <br /> <br />the surface records previously described. The data-collection program <br /> <br />by NAWC is currently scheduled to be terminated in March 1971. <br /> <br />Results to Date <br /> <br />A preliminary analysis of the meteorological observations has been <br /> <br />made for the purpose of this statement. A more complete analysis is in- <br /> <br />tended for completion in May 1971. <br /> <br />The winds in Huntington Canyon are observed to be a vigorous <br /> <br />mountain-valley system with classic up-canyon flow during daytime hours <br /> <br />and down-canyon flow during night and morning hours. The morning transi- <br /> <br />tion occurs around 9 to 10 a.m. and the evening one between 4 and 7 p.m. <br /> <br />Seasonal variations have been observed with considerably stronger winds <br /> <br />11 <br />