I have to shoot from a raised building to shoot past 300 yards. I was shooting today at 600 yards before I got up in the building I sat outside for a few minutes and got the high, low, and average wind and the direction. Part way through shooting I was off target, the wind switched from a half value to a full value. All there is for indicators is grass and some tress further out past the targets. It was pretty tough to tell the difference between the half vs full value switch just from the grass/trees. All that’s really giving me is general direction and if there’s a gust. Without hanging a bunch of flags which I don’t want to do is there anything else I can look at? Or is this just a case of needing more practice reading the wind? I did see the mirage but to be honest I’m not great at reading that yet. Thanks in advance.