P-vectors

The P-vector is defined by the following equations:
P₁=-f*[(u*dv/dx)+(v*dv/dy)]
P₂=f*[(u*du/dx)+(v*du/dy)]
where the partial derivatives were calculated with the use of the cdiff function in GrADS.

Note that the Coriolis parameter used here is defined as f=2*Omega*sin(latitude) and the winds used in the calculation are the observed zonal and meridional winds and are not geostrophic.

The vectors were made by plotting the vector sum of P₁ and P₂ and colored by the magnitude of the resulting vector.