GOALS (1) Define the State of Knowledge in the Two Countries for Severe Weather and Regional Climate Variability and Predictability, and (2) Identify the Most Important Challenges for the Next Decade. THEMES Extreme Weather and Climate -- with emphasis on linkages across the weather-climate interface. Simulation of Mesoscale Phenomena -- with emphasis on contemporary models (e.g., leading Chinese model and WRF) and data assimilation and ensemble forecasting systems. Severe Weather Processes and Predictability -- with emphasis on high impact convective and mesoscale systems