Are the mass and velocity values defined at the same grid point in RUC output grids?
The answer is yes. The native RUC model horizontal grid is an Arakawa C grid, in which there is staggering. This is in the model itself. However, all RUC wind output, even in the hybrid-b native vertical coordinate, is unstaggered back onto the mass points. So that is what you are seeing in any output file, unstaggered winds.
