Synopsis: The Ozone Mapping and Profiler Suite (OMPS) Limb Profiler makes measurements of limb-scattered solar radiances over Ultraviolet and Visible wavelengths. These measurements are used in retrieval algorithms to create high vertical resolution ozone profiles to help to monitor the evolution of the atmospheric ozone later. The NOAA Unique Combined Atmosphere Processing System (NUCAPS) is the new generational processing system for NOAA and creates high vertical resolution profiles of atmospheric parameters the NUCAPS ozone product is made using a combination of Cross-Track Infrared Sounder (CrIS) data and a tropopause-based climatology derived from ozone sondes. It is hypothesized that incorporating OMPS-LP data as a stratospheric a-priori first guess could improve the product and, subsequently, numerical weather prediction forecasts that use the data. The main objective of this project is to incorporate the NOAA Total Assimilation of Stratosphere and Troposphere (TOAST) product, which uses OMPS-LP data, into the NUCAPS algorithm as a stratospheric a-priori. Estimates of the accuracy and precision will be generated by comparing both the inputs and the resulting product with similar products, such as measurements from the Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III-ISS). The work will also examine the impact of the new ozone information on the NUCAMS temperature retrievals.