We have conducted Observing System Simulations Experiments (OSSEs) to evaluate the impact of observations from the Global Hawk on improving the prediction of winter storms. While Observing System Experiments (OSEs) allow the evaluation of real data, they cannot be used to analyze the impact of future observing systems. On the other hand, OSSEs provide a rigorous, cost-effective approach to evaluate the potential impact of new observing systems and alternate deployments of existing systems, and to optimize observing strategies. They are also used to prepare for the assimilation of new types of data, and to optimize the assimilation of existing data. Atmospheric OSSEs determine the impact of new systems by performing data denial experiments that assimilate synthetic observations simulated from a realistic Nature Run (NR) stipulated to represent the “true” atmosphere.
During this presentation, status of current OSSEs and OSEs with Global Hawk and a discussion on future activities within SHOUT will be presented.