Also of particular interest was the development and propagation of ducted gravity waves after 1800 UTC in north Alabama. These ducted waves propagated through the heart of the UAHuntsville/NSSTC THOR Center and Hazardous Weather Testbed, which includes measurements from KHTX, MAX, the Advanced Radar for Meteorological and Operational Research (ARMOR) C-band polarimetric radar, as well as the instrument suite on board the Mobile Integrated Profiling System (MIPS), including high temporal measurements (6 Hz) by a vertically pointing X-band profiling radar. As the waves moved over the MIPS site, they were associated with correlated surface pressure and wind speed perturbations of > 1 mb and 5 m/s, respectively, which matches expectations of a linear impedance relation for a gravity wave (Koch and Golus 1988). The ducted gravity waves moved within the ARMORKHTX DD analysis domain such that complete kinematic analyses could be completed. This multi-sensor approach is likely the first complete set of observational analyses on the kinematics of ducted gravity waves within a tornadic environemnt.