Nerd stuff · Field skill
How to read wind for long range shooting
Your eyes are the only wind meter that reaches the target.
Quick answer
Read the speed off what the wind is moving: smoke drifting is about 2 mph, leaves rustling 4, twigs never still 8, dust lifting 13. Call direction on a clock face with the target at 12. Our engine prices every mile per hour at 3.2 inches of drift at 600 yards, so a 4 mph error is a foot of miss.
Elevation is a solved problem. Range the target, feed a solver the air you are standing in, dial what it says, and the bullet arrives at the right height. Wind is the part nobody solved, because no instrument can measure the air your bullet is about to fly through. It has to be read, and reading it is a learnable skill with a well-worn ladder of cues behind it. Here is that ladder, with the engine attaching a price to every rung.
3.2in
What one mile per hour of wind is worth at 600 yards. Miss by four and you are a foot off.
10.8in
What that same single mile per hour becomes at 1,000 yards.
16.1in
Cost at 600 yards of being one clock hour off, when the wind is nearly down the range.
Speed
What the wind is moving tells you how fast it is
Every marksmanship course on Earth teaches some version of the same ladder, and it works because the world is full of objects that start moving at predictable wind speeds. You are not trying to name the wind to the nearest mile per hour. You are trying to put it on the right rung, then adjust from there.
Learn the rungs in the order below and check yourself constantly. The bars show what each rung buys you in a full-value wind at 600 yards, which is the fastest way to understand why the difference between rung three and rung four is worth caring about.
The cue ladder, priced
What each observable cue is worth in inches of drift. .308 Win, 175 gr, full-value wind.
See the numbers
| What you can see | Wind (mph) | 400 yd (in) | 600 yd (in) | 1000 yd (in) |
|---|---|---|---|---|
| Smoke drifts. You cannot feel it. | 2 | 2.6 | 6.4 | 21.6 |
| Felt on your face. Leaves rustle. | 4 | 5.2 | 12.8 | 43.3 |
| Leaves and small twigs never still. | 8 | 10.5 | 25.6 | 86.5 |
| Dust and paper lift. Branches move. | 13 | 17.0 | 41.6 | 140.6 |
| Small trees sway. Grass stays flat. | 19 | 24.8 | 60.7 | 205.5 |
| Large branches heave. Wires whistle. | 25 | 32.7 | 79.9 | 270.4 |
Two practical notes. Grass and light brush respond to gusts faster than trees do, so watch grass for what the wind is doing right now and watch treetops for the trend. And read several places at once, not one: the flag at your bench, the grass at 200 yards, the tops of the pines at 600. When those three disagree, that disagreement is the real information.
Direction
Call the angle on a clock face
Speed is only half a call. A 15 mph wind straight down the range does less to your bullet than a 5 mph wind across it. Shooters name direction on a clock: you stand at the middle, the target sits at 12, and you call the hour the wind is coming from. Wind out of 3 o'clock is on your right cheek and pushes the bullet left.
How much of the wind actually pushes
Measured share of full value by clock hour, from a 10 mph wind at 600 yards.
See the numbers
| Wind from | Share of full value | Drift at 600 yd (in) | What you call it |
|---|---|---|---|
| 12 o'clock | 0.000 | 0.0 | no value |
| 1 o'clock | 0.503 | 16.1 | half value |
| 2 o'clock | 0.869 | 27.8 | three-quarter value |
| 3 o'clock | 1.000 | 32.0 | full value |
| 4 o'clock | 0.863 | 27.6 | three-quarter value |
| 5 o'clock | 0.497 | 15.9 | half value |
| 6 o'clock | 0.000 | 0.0 | no value |
There is a trap hiding in that dial, and it changes where you spend your attention. Near 3 and 9 o'clock the value barely moves, so calling 3 when it is really 2 costs only 4.2 inches at 600 yards. Near 12 and 6 the value is changing fastest, so calling 1 o'clock when it is really 12 costs 16.1 inches at the same distance, four times as much. The wind you are most tempted to wave off as a headwind is the one where your direction call has to be sharpest.
The full physics behind those fractions, including the small vertical shift a head or tail wind adds, is in the companion piece: how does wind affect a bullet at long range.
Mirage
The one cue that looks downrange
Everything on the cue ladder tells you about air near an object you can see. Mirage tells you about air in the space between objects, which is where your bullet actually lives. Put a spotting scope or your riflescope on the target, then back the focus off until the shimmer sharpens. The heat waves rising off warm ground lean with the crosswind, and how far they lean is your read.
Reading the boil
The classic mirage ladder. Field convention rather than engine output, and the reason it stops at 12 mph is that mirage does.
See the numbers
| What you see | What it means |
|---|---|
| Boiling straight up | No crosswind, or a pure head or tail wind |
| Waves lean and roll | About 1 to 3 mph |
| Waves flatten and run | About 4 to 7 mph |
| Flat, fast streaming | About 8 to 12 mph |
| Washed out, nothing to see | Over about 12 mph. Go back to vegetation |
Two things make mirage worth the practice. It reads the air at whatever distance you focus on, so racking the focus from 300 yards out to the target walks you along the flight path and shows you where the wind changes. And a straight vertical boil is the single most useful thing you will ever see through a scope, because it means the crosswind is genuinely zero rather than merely light. The catch is that mirage needs sun and warm ground, and it disappears in the wind speeds where you need it most.
Timing
Good shooters call the wind at the shot, not before it
Watch anyone who wins matches and you will notice they do not decide the wind, dial it, and then settle into the rifle. They settle in first, hold the correction in their head, and keep reading right up until the trigger breaks. If the grass lies down while they are behind the gun, they either move the hold or they come off the trigger and wait for the condition to return.
The reason is that wind is not a number, it is a range of numbers that keeps re-rolling. A field that reads 6 to 12 mph over a minute is a spread of 6 mph, and at 600 yards that spread is 19 inches of uncertainty. Shooting the average of the whole minute is a coin flip. Waiting for the condition you already have a call for, and firing in it, turns the same field into a shot you can make. Wind reading is mostly patience wearing a technical costume.
This is also the practical argument for keeping the arithmetic off your plate. If forming the hold takes you thirty seconds of thumbing a chart, the condition you called is gone before you fire it.
The meter
What a handheld wind meter is actually for
A handheld anemometer is a genuinely good piece of kit, and it is almost always sold for the wrong reason. It will not tell you what to hold. It samples a few cubic inches of air at arm's length, and your bullet is about to fly through half a mile of air that nobody sampled.
The reach of an instrument at your shoulder
Where the drift on a 1,000-yard shot gets set, against where a meter can see. Illustration; the inch figures are engine-computed.
See the numbers
| Stretch of the flight | Drift it sets | Can you measure it? |
|---|---|---|
| First 300 yards | 55 in of 108 | Yes, this is where you stand |
| Last 700 yards | 53 in of 108 | No, only mirage and vegetation |
What a meter is superb at is training your eye. Stand in the condition, look at the grass, say a number out loud, and only then look at the display. Do that fifty times across a season and your unaided calls will land inside 2 mph, which holds your wind error at 600 yards to about 6 inches instead of the 16 inches a 5 mph miss costs. A few weeks of that discipline is worth more than the meter ever will be in your hand at the shot, when it is one more thing to fumble while the condition you were waiting for passes.
The one place a meter earns its keep in real time is the other half of the solution: temperature, pressure, and humidity change slowly and do apply to the whole flight, so a reading taken minutes ago is still good. That is exactly the half a watch can handle without being asked.
The cost
What a wrong call actually costs
It helps to know what you are buying with all this practice. Below are five ordinary mistakes, each priced by the engine at 600 yards, with a steel plate and a competition scoring zone drawn in for scale.
Five ordinary wind-call mistakes, priced
Inches of horizontal miss at 600 yards. The table gives 400 and 1,000 as well.
See the numbers
| The mistake | 400 yd (in) | 600 yd (in) | 1000 yd (in) |
|---|---|---|---|
| Speed: you called 10 mph, it was 12 | 2.6 | 6.4 | 21.6 |
| Speed: you called 5 mph, it was 8 | 3.9 | 9.6 | 32.4 |
| Speed: you called 10 mph, it was 15 | 6.5 | 16.0 | 54.1 |
| Direction: one hour off with a square crosswind (called 3, it was 2) | 1.7 | 4.2 | 13.9 |
| Direction: one hour off near the head wind (called 1, it was 12) | 6.6 | 16.1 | 54.7 |
The lesson buried in that chart is that a direction error and a speed error can cost the same. Being one clock hour off with a wind near 12 o'clock costs 16.1 inches, the same as calling 10 mph in a 15 mph wind. Most shooters spend all of their practice on speed and almost none on angle.
How tight your call has to be, by distance
One mile per hour of wind is the natural unit of a wind call. Here is what it buys at each distance, which is also a good way to decide how far you have any business shooting in a given condition.
| Distance | Cost of 1 mph (in) | Cost of 1 mph (MOA) |
|---|---|---|
| 100 yd | 0.07 | 0.070 |
| 200 yd | 0.30 | 0.145 |
| 300 yd | 0.71 | 0.225 |
| 400 yd | 1.31 | 0.312 |
| 500 yd | 2.13 | 0.406 |
| 600 yd | 3.20 | 0.509 |
| 700 yd | 4.55 | 0.621 |
| 800 yd | 6.24 | 0.745 |
| 900 yd | 8.31 | 0.881 |
| 1000 yd | 10.82 | 1.033 |
Read that table as a discipline. If your honest calling accuracy is 2 mph and you want to stay inside a 10 inch vital zone on wind alone, you are good to about 500 yards. Getting to 1,000 does not need a better rifle. It needs calls inside half a mile per hour, or the patience to wait for a calm.
Where the app fits
The call is yours. The arithmetic is not.
Nothing on this page can be automated, and Wrist Dope does not pretend otherwise. It does not see the grass at 300 yards and it does not read the boil. What it removes is the step between your call and your hold: you give it your best wind call, a speed and a clock position, and it turns that into a windage hold instantly, with your load, your range, and the air at your firing point already in the answer. That is the difference between calling wind and calculating it, and only one of those is worth your attention while the condition is up.
Read the physics half: how does wind affect a bullet at long range
The takeaway
The wind is your call. Everything else is handled.
Wind is the one input on this page that no sensor can read for you. Every other part of the solution is already done before you break the shot: station pressure from the barometer on your wrist, altitude from GPS, temperature from live local weather, your zero, the math. That is the point of carrying the solver on a watch. The entire problem except the wind is finished, so all of your attention goes where only you can spend it.
So read the grass, the trees, the mirage, and make the call. Give Wrist Dope your best wind speed and direction and it turns that call into a hold instantly, at the shot, with cold fingers, no card and no arithmetic. It will not pretend to see the air downrange, because nothing can. What it does is make your call count.
Common questions
- How do you estimate wind speed without a wind meter?
- Read what the wind is moving. Smoke drifting with nothing felt on your face is about 2 mph, leaves rustling 4, twigs and leaves never still 8, dust and loose paper lifting 13, small trees swaying 19. Each rung matters: at 600 yards our engine prices every mile per hour at 3.2 inches of drift.
- What is the clock method for wind direction?
- Put your target at 12 o'clock and yourself at the middle, then name the hour the wind comes from. We measured a 10 mph wind at 600 yards from every hour: 3 and 9 o'clock give the full 32.0 inches, 2 and 4 give about 27.7, 1 and 5 about 16.0, and 12 and 6 give nothing sideways.
- Do you need a wind meter for long range shooting?
- Not at the moment of the shot, and it cannot help you there anyway: it samples the air at your shoulder, while roughly half the drift on a 1,000-yard shot is set past the 300-yard mark. Its real value is training. Estimate first, then measure, and your calls tighten fast.
- How accurate does a wind call need to be?
- Tighter as the range grows. One mile per hour is worth 0.71 inches at 300 yards, 3.2 inches at 600, and 10.8 inches at 1,000. Inside 400 yards a 2 mph error keeps you on a 10 inch plate. At 1,000 the same 2 mph error is 21.6 inches, a clean miss.
- Should you read the wind at your position or downrange?
- Both, weighted toward your own. Wind over the first 300 yards of a 1,000-yard shot accounts for 55 of the 108 inches of drift, so your position carries the most weight and is the only place you can measure. The other 53 inches come from air you can only look at, using mirage, grass, and treetops downrange.
This is the field-skill half of a pair. For where the numbers come from, including why drift grows with the square of range and why the wind at your muzzle carries the most weight, read how does wind affect a bullet at long range.