Question: Lately I’ve been hearing the term “eddy dissipation rate” used for turbulence forecasts. What is it and how should I interpret it?
Answer:
How Do You Interpret an Eddy Dissipation Rate?
EDR quantifies turbulence for a specific aircraft, and it’s not a measure of the likelihood of turbulence—just the intensity.
Key Takeaways:
- Eddy Dissipation Rate (EDR) is an aircraft-independent meteorological field (m²/s³) that quantifies the *intensity* of atmospheric turbulence, measuring how rapidly atmospheric eddies dissipate.
- EDR values range from 0 (smooth) to 1 (extreme turbulence), often scaled 0-100 for ease of use, with higher numbers indicating greater mixing and turbulence.
- Critically, while EDR itself is aircraft-independent, its interpretation into felt turbulence categories (light, moderate, severe) is highly dependent on the aircraft's weight class, meaning the same EDR value can represent different turbulence levels for different aircraft.
- Aviation tools like EZWxBrief utilize EDR to provide categorical turbulence forecasts, color-coding predicted conditions based on the pilot's specific aircraft weight class.
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