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• Typically, stable conditions (Classes 5 and 6) occur at night as a result of <br />two factors. Cold air flows downs lope from [he higher elevations to the north <br />and [o the south (termed a drainage flow) and collects near the ground along <br />the Yampa River Valley. The net output of radiation from the earth and low <br />wind speeds coupled with the drainage flow produce a stable layer of cold air <br />which is termed an inversion. This inversion is a function of the length of <br />nocturnal hours and is 180° out of phase with solar insolation. A nocturnal <br />stable condition is quite normal for the Craig area (Stearns-Roger, 1975). <br />Temperature inversions will break up and transitional conditions develop as <br />sunlight. warms the ground surface in the morning. <br /> <br /> <br />• <br />2-24 <br />