One thing one needs to take into account, what the wind is doing at your firing point, may or may not be doing the same thing at your target.
When I was running sniper schools, one to the first thing I would do, was to pop smoke at differant distances between 100 - 1100 yards, normaly the smoke went every which way.
Up to about 12 -15 mph, you should use mirage to determine the velocity of wind as it seems to average out the wind.
Past that speed, the wind is normaly constant. Also not everyone sees the same conditions looking through the scope,
Reading wind & mirage takes many hours of burning your eyes looking through a scope.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071