Measurements of the complex flows through an operational wind farm using research-grade mobile Doppler radar technologies are introduced. Novel deployment strategies and data analyses techniques provide the first known dual-Doppler synthesized wind fields describing flow evolution within a large grouping of utility scale turbines. Turbine-to-turbine interaction, the evolution of turbine wakes, transient gust features, and the influence of local roughness heterogeneity and terrain changes are discussed. The impact of horizontal and vertical wind flow variability is assessed within the wind farm and across individual rotor sweeps, including the examination of vertical wind speed profiles. The presented measurement technologies and techniques † offer an innovative alternative for observing the complex flows within and nearby an operational wind farm, offering the potential to contribute to the next generation of anticipatory control systems.