Sources of remotely sensed atmospheric data have expanded rapidly within the last several years, including ground-based Doppler weather radars and several satellite-based, earth- observing systems that sense and record large-scale weather conditions. Although these systems are capable of producing voluminous amounts of data, tools for visualizing, analyzing, and applying the data for operational uses requiring 4D display have not kept up. This paper presents a discussion of a software system known as WEST (Weather Environment Simulation Technology). WEST was developed through internal funding at Southwest Research Institute, for the visualization and simulator integration of very large atmospheric data sets containing fine-grained weather features. The approach implemented within WEST allows the user to visually observe, 'fly through', and interact with recorded atmospheric data at real-time speeds using commercial off-the-shelf hardware. This new capability is designed to benefit such diverse applications as flight training, weather analysis, systems design, and mission planning.