weather effects...
this may be covered elsewhere, but with recent incidents, i felt maybe a small thread with information shared by people who may have experienced similar effects may be positive to the WS/jumper population... my thoughts on this is, when flying over a terrain, which may be rock and grass/trees, when you cross over a new terrain, the temperature will change, with temp change comes air density change, and you may find yourself in some "sink" over the rocks that you didnt find while flying over the previous grass field. im not a WS flyer, but just an angle to analyze, Also mid day warm days, are a breeding ground for thermals, and should be a more cautious flying time.