There are 10 fixed sectors can be used to see regional gridded mesoanalysis data across the United States (additional sectors are at the top of the map where it says "Change Sector"). This information is provided by SPC as a way of sharing the latest severe weather diagnostic techniques with local forecasters. For more detailed information about this product and the different parameters involved, please click here.

The SPC runs a comprehensive surface objective analysis scheme called SFCOA. The system runs at the top of each hour, using the latest 40km RUC forecast grids as a first guess. Next, the surface data is merged with the latest RUC forecast/analysis upper-air data to represent a 3-dimensional current objective analysis. Finally, each gridpoint is post-processed with a sounding analysis routine called NSHARP to calculate many technical diagnostic fields related to severe storms.