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2.1.3.3 Wind Direction <br />The predominant wind direction throughout all [he meteorological studies for <br />the Yampa Project (1971-1976) and at all three (3) monitoring stations (Figure <br />2.1-1) is from [he southwest quadrant as presented in Figures 2.1-3 to 2.1-9. <br />These prevailing winds from the southwest are a direct consequence of [he <br />channeling effects of the local terrain (Section 2.1.3.1) and [he mesoscale <br />(regional) southwesterly to westerly winds (Section 2.1.3). <br />Wind direction monitoring (1970-1972) at meteorological site C1 defined a sin- <br />gle prevailing wind direction from the southwest (Figures 2.1-3 and 2.1-4) <br />because of shielding effects from topographic features. Further studies at <br />site C2 more accurately qualify a second prevailing wind direction from the <br />northeast (Figure 2.1-5) and a lower frequency of occurrence from [he south- <br />west (Stearns-Roger, 1975). Figure 2.1-6 shows [his same trend for the Thomp- <br />son Hill Met Station (1975) although a greater frequency of northeasterly or <br />upslope air movement occurs at this station. <br />• Stearns-Roger (1975) stated that [he low level air flows were separate from <br />the upper westerly mesoscale winds at an elevation of 200 fee[ above the <br />ground level a[ site C2 (6500' MSL). <br />Figures 2.1-7 through 2.1-9 show the wind rose frequencies for all stability <br />classes (Section 2.1.3.2) from 1974 through 1976 respectively. <br />• <br />2-25 <br />