I have flown out of Minden during a visit to the U.S. a couple of years ago, in search of some wave. Never did find any, but some pretty good ridge lift up in the mountains. I suspect that the "wind" which caused the inflight break-up was caused by the rotor in a mountain lee wave. Check it out here:
Lee wave - Wikipedia, the free encyclopedia
I got caught out in some horrendous rotor when climbing out of Dishforth (EGXD) in an Astir back in January of '83 to connect with the wave over Ripon race course. During the climb the undercarriage was lowered and the airbrakes opened by the turbulence, and raised and closed by me (several times) whilst on tow behind the Supermunk. Once free and established in the climb, I released the tow, marked the Barograph at 4K' and climbed at 14 Kts. initially, decaying to 6 Kts at TOC - 23K'. Such is the "power of the wind"