Boundary Layer Turbulence Index: Progress and Recent Developments

TL;DR

This paper introduces a boundary layer turbulence index (TIBL) derived from numerical model data, validated during winter events, and demonstrates its practical utility in aviation, ground safety, and wildfire risk assessment.

Contribution

The paper presents a new turbulence index (TIBL) based on RUC-2 model data, with validation and demonstration of its operational usefulness in hazard assessment.

Findings

TIBL effectively predicts turbulence hazards for low-flying aircraft.

Validation shows strong correlation with observed wind events.

Operational utility demonstrated in wildfire and transportation safety.

Abstract

A boundary layer turbulence index (TIBL) product has been developed to assess the potential for turbulence in the lower troposphere, generated using RUC-2 numerical model data. The index algorithm approximates boundary layer turbulent kinetic energy by parameterizing vertical wind shear, responsible for mechanical production of TKE, and kinematic heat flux, parameterized by the vertical temperature lapse rate and responsible for buoyant production of TKE. Validation for the TIBL product has been conducted for selected nonconvective wind events during the 2008 winter season over the Idaho National Laboratory mesonet domain. This paper presents studies of four significant wind events between December 2007 and February 2008 over southeastern Idaho. Based on the favorable results highlighted from validation statistics and in the case studies, the RUC TIBL product has demonstrated operational utility in assessing turbulence hazards to low-flying aircraft and ground transportation, and in the assessment of wildfire threat.