Merlin Weather and Prediction Software


Merlin and the great Merlin Manual on a thumb drive shipped to you. Merlin displays current weather, provides communications between the weatherstation and your computer, and has powerful tools for drag racing predictions. Merlin ships free with each Altalab weatherstation and is available as a free download.

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Merlin Included

Merlin ships FREE with each Altalab weatherstation. Upgrades are free during the warranty period. There is no annual fee to update *. Merlin displays current weather, provides communications between the weatherstation and your computer, and has powerful tools for drag racing predictions.

The current version is 8.3 for 64 bit versions of WinXP, Windows 7, Windows 8 and Windows 10. Merlin is available as a free download to registered owners. Registered owners can purchase Merlin on a thumb drive shipped to them.

SMS Upgrade

When you purchase your weatherstation direct from Altalab, the Weather Texting Option is included free. For others, the Weather Texting Option is available for a one time fee.
graphing weather data

Live Information Display

Merlin offers several options for viewing live weather on your PC.

Single Current Reading

All the weather variables at a glance, updating every 20 seconds.

Trend Weather

All the weather variables at a glance, updating every five minutes, with accumulating readings onscreen. View as text or as a graph and watch weather trends unfold. Overlay weather from another day to compare and anticipate changes. Within Trend Weather in a Pick function to allow weather data to integrate with your Racepak data logger.

Live Predictions

View live ET and TS predictions for up to 5 users.

Merlin Tools – Communication with your Altalab Weatherstation

Merlin provides communications between Altalab weatherstations and your PC.

Merlin Preferences Screen

  • Customize which data is transmitted to the pager (Choose from 4 measured and 8 calculated)
  • Turn ON/OFF optional Anemometer hardware
  • Turn OFF previously created predictions
  • Manually set weatherstation time
  • Automatically set weatherstation time to your PC on launch

AltaCom Live Screen

  • View Live Weather Readings
  • View live 60′ ET and TS Predictions
  • View and Graph Weather Trend
  • Save and Print Weather Trend
  • Overlay Weather Trend with Saved Weather
  • Pick a Weather Reading to Export to RacePak
  • Set Time and Date
  • Calibrate and View Calibration Data
  • Download Logged Weather Data from hardware
  • Clear Data Logs
  • Set up SMS (texting for 4x, 4xR, Alta and AC2)
  • Set up Paging (for 4xR)
  • turn Sensor fan off in inclement weather

ET and TS Predictions

  • Graph Runs, Graph Runs by Lane, Graph Runs by Selection
  • Predict ET and TS from a single run
  • Predicts 60′
  • Create multiple predictions for texting, paging and live display
  • Customize predictions using Performance Factor
  • Calculate Sea Level ET
  • Calculate AA
  • Determine Throttlestop Ratio

For sportsman drag racers, Merlin has powerful tools for ET and Throttlestop prediction. Automatic graphing lets you select the best references, and helps you spot and diagnose prediction and jetting problems. Merlin calculates Sea Level ET for each run, a valuable diagnostic tool for improving prediction accuracy.

Merlin lets the user handle multiple vehicles, and create live predictions for up to 5 vehicles. You can customize predictions for each vehicle separately. Store up to 16 runs per file, create as many files as desired.

Create separate predictions for high humidity and low humidity conditions, for left and right lane differences or any other factors that influence your vehicle.

Text (SMS and email) weather and Predictions (AC4x, 4xR and legacy Alta and AC2).

Send current weather and predictions to your pager (AC4xR and legacy AC2).

Merlin Manual

The Merlin Manual is filled with step by step instructions and pictures to help racers quickly get up to speed. It can be found on your Merlin thumb drive and in a Help file within the Merlin program. downloads are available to registered owners.

  • Step by Step Instructions
  • Advanced ET and TS Prediction
  • Sample Files and Tutorials
  • Screenshots and Pictures

*There may be a nominal charge for updates after the 3 year warranty has expired.

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  • What Racers Say:

    "I have used Alta-lab weatherstations for over 20 years.They have an excellent product and have customized the product to fit our needs. A great company with excellent customer service." Jim Prock