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 measure (m²/s³) that quantifies the intensity of atmospheric turbulence by indicating how rapidly eddies (swirling air) dissipate; higher rates signify greater turbulence.
- EDR values typically range from 0 (smooth air) to 1 (intense mixing, often scaled 0-100 in forecasts), with higher values representing more intense atmospheric mixing.
- The actual experience of turbulence for a given EDR value varies significantly based on the aircraft's weight class (light, medium, or heavy), meaning an EDR value considered moderate for a light aircraft might be light for a heavy aircraft.
- Aviation forecasting tools use EDR, adjusting its interpretation and color-coded thresholds to provide categorical turbulence forecasts (e.g., light, moderate, severe) specific to the aircraft's weight class.
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