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<br />• <br />prevailing. Winds at upper levels of the atmosphere over the region <br />are predominantly from the westerly sector. Harsh winter storms are <br />i~ not unusual in the region. However, severe weather occurrences such <br />as tornadoes and hail are infrequent. <br />~ The capability of the atmosphere to disperse pollutants is much <br />greater during the day than during the night and early morning. In <br />the lease region as well as in the western mountain region in <br />~ general, the average afternoon atmospheric dispersive capability is <br />relatively good and the morning dispersive capability is relatively <br />poor compared with most of the remainder of the nation. The <br />~ frequency of air stagnation episodes is generally greater in the <br />lease region and western mountains than in the remainder of the <br />nation. <br />Climatological data for the lease areas are presented in Table 3-1. <br />Where specific on-site data are unavailable, data for Yampa, 15 <br />~ miles to the southeast, are presented. Otherwise, the values shown <br />in Table 3-1 are interpolated from isopleths covering the region. <br />~ An annual wind rose for a meterological tower located about 9 miles <br />northeast of the proposed lease areas of Pittsburg and Midway Coal's <br />Fish Creek monitoring site near Oak Creek is shown in Figure 3-1. <br />~ The wind rose presented is considered reasonably representative of <br />the lease areas. <br />• <br />E-12 <br />0001E <br />~ 08/15/85 <br />