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500 hPa Height, QGPV, RHS QGPV Height Tendency Equation

Caption:
+500 hPa geopotential height (solid contours every 6 dam).
+500 hPa quasi-geostrophic potential vorticity (dashed contours in PVU).
+Total RHS of QGPV form of QG height tendency equation [shaded according to the colorbar (10^-13 s^-3)]. Warm (cold) colors denote regions of forcing for 500 hPa geopotential height falls (rises).
+Image was generated from 1.0x1.0^o NCEP-GFS data smoothed by a Gaussian filter with a weight of 25.