Calmaboard

Tested before we built the app

We checked our estimate against a year of reports from real flights, October 2025 to September 2026, before writing a line of the app.

North America, 336,360 pilot reports. Pilots report the bumps they meet, or a smooth ride. We took the reports made at cruising height and compared clear bumps with smooth rides. Light bumps were left out of this score.

Take one bumpy report and one smooth report from the same place: about 2 times in 3, our estimate was higher where the bumps were.

What it is not

Is Calmaboard a safety tool? No. It is an estimate based on weather forecasts. Keep your seatbelt fastened whenever you’re seated, and always follow the crew’s instructions.

It looks at bumps caused by winds at cruising height, not at storms. Climb and descent are not covered, and routes over the polar regions get no forecast.

This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Source: www.ecmwf.int. This ECMWF data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0). ECMWF does not accept any liability whatsoever for any error or omission in the data. Calmaboard computes its own turbulence estimate from this data (modified).

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