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 by measuring how rapidly eddies dissipate, with higher rates indicating more turbulent air.
- EDR values typically range from 0 (smooth) to 1 (extreme mixing), often scaled to 0-100 in aviation forecast tools for easier interpretation.
- While EDR itself is aircraft-independent, its interpretation for categorical turbulence intensity (e.g., light, moderate, severe) is highly dependent on the aircraft's weight class, meaning a single EDR value will affect different aircraft types differently.
- Aviation forecast applications use EDR with specific thresholds for light, medium, and heavy aircraft to provide color-coded categorical turbulence predictions, although the thresholds for light and heavy aircraft are primarily theoretical and not yet fully empirically verified.
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