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with neutral or unstable conditions. In the transition period between <br />• stable and neutral or unstable conditions, surface winds tend to be <br />light and variable. <br />Wind data from the Federal Aviation Administration at the Hayden Airport <br />(the closest reporting station collecting wind data) shows wind <br />velocities of 3 to 15 miles per hour from the east to northeast 16.3 <br />percent of the time and from the west to southwest 31.3 percent of the <br />time. Also, winds from the west-southwest with velocities exceeding 15 <br />miles per hour occur 7.5 percent of the time. Winds so light that their <br />speeds were not detectable (0 to 3 miles per hour) occurred 6 percent of <br />the time. The remaining 34.4 percent of the observations occurred <br />randomly. <br />• <br />r1 <br />U <br />?.04.8-11 <br />