CYS: 3DVAR Rotation Products on a Tornadic Supercell

3D-VAR products have performed well given lack of radar coverage. They depict strong vorticity associated with a low level mesocyclone and tornado. Comparison to the MRMS rotation tracks confirms the location of this tornado, though the magnitude isn’t quite as significant. The second 4panel is from a later time with 3 distinct supercells in the CYS area. Again, 3DVAR shows skill in defining the greatest updraft areas as well as stronger updraft helicities associated with mesocyclones.