Simulating the 2011 April American South Tornado Outbreak with the WRF-RTFDDA-LES system

Multi-scale interaction is one of crucial processes in weather and climate prediction. In this exploratory study, three-dimensional WRF model is used as an atmosphere proxy to investigate orographic mesoscale wave, its propagation, and interaction with large-scale processes. A high-resolution global WRF simulation serves a prefect model product, and a set of experiments with two-way nested WRF are then conducted to study the mechanics of orographic mesoscale processes and feedback to large-scale atmospheric circulation. Detailed spectral analysis is applied to the experimental results.