Regional Observations of Convectively-Induced Turbulence from Varied Resolution Full-Physics Models

Convectively-induced turbulence (CIT) poses both a serious threat to aviation operations and challenges in forecasting applications. CIT generation and propagation processes occur on scales between 10-1000m and therefore are best treated with high resolution cloud resolving models. However, high resolution model simulations are computationally expensive, limiting their operational use. In this study, summertime convection in the North Dakota region is simulated over a one-week period using a variety of model setups that are similar to those utilized in operational and research applications. Eddy dissipation rate (EDR) and Ellrod Index, both popular turbulence metrics, are evaluated across various model resolutions and compared to in-situ observations of EDR from commercial aircraft. Pilot reports are also included in the comparison of turbulence values. The variability of turbulence values with respect to model resolution and distance away from convection are investigated. Results highlight biases of model-estimated turbulence for various model resolutions and turbulence indices.