Now, all we need is enough wind, or maybe not.[sic] Slide 8 ...now we get to the Don Quixote part

These algorithms are yielding “quite erroneous” estimates in mountainous terrain. The roughness factor clearly requires much more locally based evaluation. Terrain based factors for “wind-turbulence” impact in mountain terrain is not addressed, thereby, making data extrapolation less reliable. Wind shear, the radical shifts in wind flow are most common in the mountains. The wind characteristics that attract migrating species, thermals and downdrafts along ridges create a “roughness” factor on an extreme ratio of difference as described here that it become apparent that site specific data and analysis must be undertaken in mountainous terrain.

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