Comparative Studies of 500 mb Barotropic Forecasts Based on Different Analyses

Some barotropic 500 mb forecasts are compared in the following manners:

1 comparison of the differences between forecasts made from analyses with identical boundary regions but different inner parts

2 comparison of forecasts made from two independent analyses based on identical material, and

3 comparison between forecasts based on two analyses with identical inner region but different boundary regions.

The result of a computation of the standard deviation of the vorticity and the Jacobian J (η, φ) is given and discussed, the deviation being due entirely to the personal factor in upper air analysis.