The CrIS/ATMS onboard the NPP/JPSS (Joint Polar-orbiting Satellite System) provide not only the high vertical resolution information but also good spatial information. In-situ measurements (e.g., radiosondes) provide less spatial information, but are needed for validation purposes. An impact study through assimilating NPP/JPSS products in regional numerical weather prediction (NWP) models can help the evaluation of both the spatial and vertical information, as well as evaluation of the products over the ocean and areas where in-situ measurements are rare. In addition, using the hyperspectral infrared water vapor and cloudy channels in NWP is still challenging, the impact study can help understand and enhance the application of water vapor and cloud information from NPP/JPSS. The AIRS/AMSU is used to emulate the CrIS/ATMS in this study, both the singe field-of-view (SFOV) and science team products are asssimilated in WRF (Weather Research and Forecasting) with the 3DVAR, Ensemble Kalman Filter (EnKF), and 4DVAR assimilation techniques. The AIRS/AMSU products are applied to severe storms such as convective precipitation and hurricanes for forecast improvement. Preliminary results show that AIRS soundings with quality control improve the hurricane track and intensity forecasts, as well as the precipitation forecasts. AIRS provides good temperature and moisture information between 200 and 800 hPa for several weather forecasts, this impact study can also include other products such as cloud, precipitation etc.