As @lawman29 stated, you can get a feel for velocity based on the movement in the flag, not just the angle to the ground. Want to get burned by a let off? Just take your shots when the wind is at max velocity/flag out near horizontal...but disregard the 'ripples'. Keep shooting when the flag starts to show lazier ripples but still at the same angle to the ground...and wait for the spotter showing up "upwind" near your aim point. The inertia of those big old flags will hold the flag up for a few seconds before the angle changes in an abrupt let off...but the ripples will get to a lower frequency first, portending the coming let off. Been there, done that, have the scars (or should I have said scores?). There is a lot of information in those flags...angle to the ground, angle to the axis of the range and rippling motion.If you shoot when a flag is fully extended you know direction but you actually don’t know what the speed is. You just know it’s blowing hard enough to at least fully extend the flag. You’ll have to shoot on a less severe condition for the flag to indicate speed.
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