Another lesson over the weekend. I was hunting wolves and cats and spotted a shootable cat. It's a long story so I will cut to the point- 600 yard shot. Backside of mountain and back side of wind direction. The wind mainly had been, as facing down the finger/ravine, blowing left to right and it was gentle (3-4 mph). During my hold and target area observation it appeared the wind was NULL in this protected area. ?? Sent it, the hit was 6-9 inches left. Cat was slightly angled toward me. When I got to the area I noticed the wind was now right to left and coming up the ravine. Should have held 1 moa right, from my new calculations. Later I shot uphill at 900 yards. When I took the wind reading at my spot it was right around 6mph (2.6 moa) but a little gusty. Wind was right to left. As I hiked up the slope I was trying to take note of the wind but it was minimal in most spots, until I got close to the target. At the strongest point it was 8mph. My impact was vertically good, horizontally it was left 9-12 inches. I needed 3.4 moa according my program based on 8mph vs the 6 mph I input. The strike and the new calculation look about right. When I got the saddle, above this test shot, the wind was 12. Crap. I am not new to the mountains of course but reading wind for hunting game seems significantly different than shooting. I have noticed all sorts of weird things with the wind lately such as the way it builds up, holds it's breath, then lets it go. I call it flushing. I see rivers do the same thing behind a rock. Is there a good site that helps describe wind flow and mountain terrain? I am feeling pretty inadequate and need a better wind reading education.