Traditionally, WBGT is calculated based on measurements of dry bulb temperature, natural wet bulb temperature, and black globe temperature. The dry bulb temperature is the ambient air temperature, and is a routinely measured quantity. The natural wet bulb and black globe temperatures are not routinely measured quantities, and require specialized sensors. At most United States Air Force (USAF) installations, personnel responsible for taking WBGT measurements commonly use a specialized device which measures the three types of required temperature values to calculate the WBGT value at a single point. At a large military installation such as the ETTC, with work sites spread across 724 square miles, a WBGT measurement at a single point taken once (or less) per hour fails to detect the spatial and temporal changes in heat stress across the range. Utilizing multiple WBGT sensors to obtain representative measurements across the ETTC is cost prohibitive due to the additional equipment, manpower, maintenance, and training required to take additional measurements. Therefore, this automated heat stress display system at the ETTC which utilizes regularly measured meteorological variables provides improved temporal and spatial resolution of critical heat stress data to personnel working outdoors and managers during the ETTC’s hot and humid summer and saves significant manpower, training, and equipment costs. This presentation describes the development of the WBGT estimation equation and implementation strategies at ETTC.