We had an accident today at the Y.  No reports have been filed and we don't know much.  What we do know is that the winds aloft forecast for the area was 21mph at 12k ft.  Measured winds at Baldy (11k ft) between 7AM and 5PM were consistently between 22mph and 29mph with gusts in the low to mid 30s.  By 6PM winds were 38mph gusting 54mph.

From the Book of Risk:

Mechanical turbulence and rotor downwind of obstacles start with winds at about 9 miles per hour.  At 12 miles per hour that turbulence has the strength to collapse a paraglider.  At 15 miles per hour the collapses become difficult to block.  At 18 miles per hour even the very best among us will begin to lose their wing. 

Conservative winds aloft numbers for intermediate pilots for the the Wasatch are 

12 mph at 12K ft.
  9 mph at 9K ft
  6 mph at 6k ft