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Wind Speed and Deer Activity
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<blockquote data-quote="BSK" data-source="post: 5192855" data-attributes="member: 17"><p>This post by Ski needs to be in double-size font, bold, italics and triple underlined!</p><p></p><p>For anyone who hunts in ridge-and-hollow terrain, you MUST understand how wind reacts to blowing across ridge-lines. When wind crosses a near perpendicular ridge-line, it is going to produce an eddy on the lee (downwind) side. I call these "roll-over" winds, as the wind rolls over the ridge and actually goes directly back into the predominant wind direction as it rolls up the back side of the ridge. On the lee side, the predominant wind holds for the top third of the ridge, but then a transition occurs to the directly opposite rollover wind, which predominates all the way to the bottom of the ridge on the lee side.</p><p></p><p>Things get even more interesting if multiple parallel ridges exist. On the windward side of a second parallel ridge, the predominant wind direction only holds for the top half to 2/3rds of the ridge. The rollover (reverse) wind will dominate the bottom half to 1/3.</p><p></p><p>Have a wind cross a ridge-line at a 45 degree angle and things get really complicated, as the wind "spirals" up the valley on the lee side (imagine a barber pole lying on it's side in the valley).</p></blockquote><p></p>
[QUOTE="BSK, post: 5192855, member: 17"] This post by Ski needs to be in double-size font, bold, italics and triple underlined! For anyone who hunts in ridge-and-hollow terrain, you MUST understand how wind reacts to blowing across ridge-lines. When wind crosses a near perpendicular ridge-line, it is going to produce an eddy on the lee (downwind) side. I call these "roll-over" winds, as the wind rolls over the ridge and actually goes directly back into the predominant wind direction as it rolls up the back side of the ridge. On the lee side, the predominant wind holds for the top third of the ridge, but then a transition occurs to the directly opposite rollover wind, which predominates all the way to the bottom of the ridge on the lee side. Things get even more interesting if multiple parallel ridges exist. On the windward side of a second parallel ridge, the predominant wind direction only holds for the top half to 2/3rds of the ridge. The rollover (reverse) wind will dominate the bottom half to 1/3. Have a wind cross a ridge-line at a 45 degree angle and things get really complicated, as the wind "spirals" up the valley on the lee side (imagine a barber pole lying on it's side in the valley). [/QUOTE]
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