High Power Wind Lab

High Power Wind Lab logo
wind analysis and shot plotting for high power shooters


Enter observed wind conditions and wind correction


Plot shots and wind to see how conditions develop over the course of string


Calculate total score, wind score and elevation score, time between shots, and review plots

High Power Wind Lab is a visualization tool for determining wind-value based on observed conditions and for calculating sight corrections necessary to hit the center of a target.

Use High Power Wind Lab on and off the range to interactively explore scenarios to better understand the wind’s affects in different situations. By changing the wind velocity and wind angle, the display dynamically updates to show the calculated correction and visualizes a range of possible outcomes if the wind conditions are misread. This interactive tool is invaluable for exploring the interplay of wind direction and velocity and the tradeoffs you need to make when deciding when to shoot and what correction to put on your gun.

High Power Wind Lab is also an advanced plotting tool for recording both shot placement and wind conditions. Use High Power Wind Lab during your shooting session to reveal predominant conditions and to limit your corrections to known good values. After shooting, review your plots to learn from your experiences.


  • True minute of angle (MOA)
  • Customizable ballistics
  • Library of commonly used mid-range and long-range TR- and F-Class targets
  • Shot / wind plotting
  • Score calculation
  • Record keeping
  • Tablet support

Do you have a suggestion that will improve the app? Please send us your ideas using the support form at the bottom of the page.

Experiencing problems? See Troubleshooting below.

Getting Started

The “start” screen is the default screen for the application and where you will begin new shooting sessions. Here you can select the Load and Target you want to use for your shooting session. Each target has a designated range (distance). It is important that you select the target and range you’ll be shooting on, otherwise the app will not produce accurate calculations.

High Power Wind Lab comes with a demo load (.308, 175 SMK @ 2750 fps, Sea level) and a library of mid- and long-range targets. We recommend using the demo load while you’re still learning to use the app. Later, you can configure a custom load that you use with your rifle.

Select a target and click START.

High Power Wind Lab main screen

You should now see this screen:

This screen is divided into 5 sections: 

  • Wind direction dial
  • Wind flags
  • Correction scale (along the bottom)
  • Target
  • Shot record list (far right)
High Power Wind Lab record screen

Wind Direction

The wind direction dial is used to pick the direction (angle) the wind is flowing. Touch the dial to set the direction. At the 12 o’clock position, the wind is flowing directly to the targets. At the 3 o’clock position, the wind is flowing from left to right across the range.

To the left and right of the arrow are two lines that make the “pizza slice” shape. The total angle between these two lines is 30 degrees or +/- 15 degrees from the arrow. This angle represents an error in reading the wind direction.

As you record shots, pegs will appear around the perimeter of the circle. The length of the peg represents the wind velocity while the position represents the direction.

High Power Wind Lab wind dial

Wind Flags

The wind flags are used to pick the speed (velocity) of the wind. The flags approximate how they would look in the corresponding wind speed. The total range of the scale is 0 to 20 mph.

The wind selector is a wide, red bar with a thin black line down the center. The width of the bar is 3 mph wide on the scale (+/- 1.5 mph left and right of the center line). This represents an error in reading the wind velocity.

Touch the flag that most closely resembles an observed flag or slide the selector left/right to select the velocity read with an anemometer. The velocity is shown just above the first flag on the left (see “18.0 mph” in the picture above).

High Power Wind Lab flags

Correction Scale

Use the correction scale to set the left/right correction (or hold over) you intend to put on your gun for the current shot. The scale defaults to the calculated wind correction, but can be set to a different value by dragging it left or right.

The scale is divided into 1/4 MOA increments and the red line in the center indicates the selected value.

The green dot is the calculated wind correction according to the selected values of the wind velocity (wind flags) and direction (wind direction dial).

The blue dots indicate the correction needed if the wind is +/- 15 degrees of the selected wind direction. These dots correspond to the lines adjacent to the arrow on the wind direction dial.

The red dots indicate the correction you would need if the wind is +/- 1.5 mph of the selected wind velocity. These dots correspond to the edges of the red wind flag selector.

High Power Wind Lab correction scale


The target serves two functions:

  • Record shots
  • Show the range of impacts if the wind is misread

The blue bar, red bar, and small green dot correspond to the dots on the correction scale. The width of the bars corresponds to the distances between the dots converted from MOA to inches on the target. The scale of these bars are calculated using a true MOA conversion for the distance to the target.

In this screenshot, the blue dots are positioned at 5.75 ~ 6 Left and 2.25 Left, which is approximately a 3.5 MOA span. On the target, this is represented by the blue bar extending from the mid 8 ring left to the 7 ring right. These values are determined by the ballistics of the chosen load, the direction of the wind, and the velocity of the wind. The extreme tips of the bar are the correction you would need if the actual wind was +/- 15 degrees of the selected wind direction. The end of the red bar indicates the correction you would need if the wind was +/- 1.5 mph of the selected wind velocity.

High Power Wind Lab eight recorded shots

If you want to dope the calculated correction, you can drag the wind correction scale left or right. The bars on the target move left or right by the MOA correction selected.

High Power Wind Lab two recorded shots

Record a shot

Tap the target where your shot impacted and click the RECORD button in the upper right corner of the display. This will update the list of shots and place a marker on the target. The score and MOA offsets are shown in the upper left corner of the target..

The wind velocity and wind direction are also plotted on the wind direction dial and wind velocity scale.

To view a previously recorded shot, select it from the list on the right. Doing so will highlight the selected shot and display the corresponding wind direction and velocity. This also toggles the RECORD button to a DELETE button, which allows you to delete the selected shot.

If you need a closer view of the target, you can “pinch” zoom and drag the target face. To zoom in, put two fingers on the target and spread them apart. To zoom out, put two fingers on the target and pinch them together. You can drag the target face with one finger.

When you’re done with your string, click the EXIT button and save your shooting session.

High Power Wind Lab six recorded shots

Configure a custom load

In order for the application to accurately calculate wind deflection of your ammunition, you’ll need to configure a custom load and enter some basic ballistic data.

Use a ballistic calculator to determine the full value corrections for 100 through 1,000 yards for a 10 mph wind. A full value wind is a direct cross-wind (i.e. 90 degrees) to the direction of the target.

An excellent (free) ballistic solver is JBM Ballistics (JBM Ballistics, © JBM Ballistics, LLC, is not affiliated with Accuracy Software). Use the Simplified Trajectory solver.

Next, in High Power Wind Lab, navigate to the Loads screen (shown here) and press “New Load”

High Power Wind Lab load list screen

Enter the full value corrections from 100 to 1,000 yards into the Load editor, as shown here.

In this example, the full value corrections are entered for a Sierra 2156 with a muzzle velocity of 3,030 fps at an altitude of 4,500 feet.

When finished, click SAVE. Your custom load will now be available from the dropdown list of loads on the Start screen.

Create variations of your load for different altitude, temperature, humidity, and barometric pressure combinations so you can see how these parameters affect wind deflection.

High Power Wind Lab load editor screen

To edit or delete an existing load, from the Loads screen, swipe the entry left or right to reveal the Edit and Delete buttons.

High Power Wind Lab edit load screen
High Power Wind Lab delete load screen

Frequently Asked Questions

1) Is the application legal to use during a match?

No. This app is intended to be a training aid, both on and off the range, to help develop the intuitive understanding of how conditions will affect your shots so you can make better decisions during a match.

2) With the wind pointed at 12 or 6 o'clock, +/- 15 degress shows a potential hit in the 8 ring or wider. This can't be accurate, can it?

The software is very accurate and this is, in fact, what can happen if you misjudge a fishtailing wind. You can verify this for yourself with a ballistic calculator. Set the distance to 1,000 yards, configure your load, and set the wind angle to 15 degrees and wind speed to 10 mph. Compare the MOA offset from the calculator to the blue bar on the target. If you are using the same load configuration in High Power Wind Lab, the end of the blue bar will correspond to the calculated MOA offset. If you want a precise measurement of that point, place a spotter on the target at the end of the blue line.


Application won't progress past the splash screen

Affected Platforms: Android, iOS
Symptom: The application won’t go past the introduction screen.
Description of problem: Early versions of the application downloaded updates when the application started. If your device is attached to a slow network or if it’s downloading over the cell network, the startup time can appear slow.
Solution: The most recent version of the application doesn’t pause application startup, even if updates are available. It will start and attempt to download updates in the background. If you are experiencing the symptoms described here, then the application will start after 30 seconds. To ensure you get the latest version of the application, stop and kill the application, connect your device to a WiFi network, then restart the application. It should download quickly and start normally. As mentioned, this behavior should not resurface. If the problem persists, please contact us at your earliest convenience.

Unable to enter decimal places in Load Editor

Affected Platforms: Android
Symptom: Unable to enter decimal places in the Load Editor.
Description of Problem: Some android devices have an on-screen keyboard that doesn’t include a decimal place.
Solution: Install GBoard (Google Keyboard) from the Google Play Store. This replaces the default system keypad and includes a numeric keypad with a decimal place.

Unable to see main menu at the bottom of the screen when changing orientations

Affected Platforms: Android
Symptom: When I start the application, I initially view it with the screen oriented in portrait view. When I rotate it to landscape view, the navigation at the bottom of the screen disappears.
Description of Problem: Android has a bug that prevents it from correctly re-drawing the application with the new screen dimensions after the device is rotated.
Solution: The buttons will re-appear if you rotate the device back to the previous orientation or if you start the application in the orientation you will continue to use while running the application. Rotate the device to the original orientation to show the buttons and navigate between screens.