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State Reg. <br />winds at the Seneca II Mine'site This is due mainly'to the fact that the <br />surface winds arE highly dependent upon the topography. <br />A discussion of the winds rt the oid meteorological site does however <br />exist in a report entitled: ~`°10Analysis of the Meteorological and Air <br />Quality Data for the Seneca Mine, January 1978 -December 1978'; <br />submitted to Seneca Coals, Ltd. by Western Scientific Services, Inc.; Roy <br />M. Barnes. The discussion on winds from that report is presented below: <br />"Wind. There are two preferred wind directions at <br />the Seneca Mine site from which the wind blows 80% <br />of the time. This is induced by the local topography, <br />i.e., the north-south oriented valley as shown in <br />Map I. <br />During the night as the earth's surface cools by <br />_ radiation, the lowest level of air also cools. As it <br />becomes denser tha;~ the upper level air, it uncouples <br />from the upper level synoptic wind regimes whose <br />patterns are controlled by broad scale pressure <br />fields. This cool ~iir layer due to its increased <br />density, will flow downhill or down valley at the <br />Seneca Mire which is represented by souther~y wind <br />directions. A majority of the nights during the year <br />show this drainage flow as a preferred wind direction. <br />The other wind direction commonly exhibited at <br />Seneca Mine is up valley flow or winds from the <br />north-northwest. The predominant wind direction in <br />the annual data set for netural stability conditions <br />which are typical of synoptic events (Figure 5C) is <br />north-northwest. Historical data from the Hayden <br />power plant located to the west of the Seneca Mine <br />~ valley indicated the predominant synoptic wind <br />direction to be westerly at the surface, due to the <br />8-S <br />