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700 hPa Height, 1000-500 hPa Thickness, and Term A QG Omega Equation

Caption:
+700 hPa geopotential height (solid contours every 3 dam).
+1000-500 hPa thickness (dashed contours every 6 dam).
+Term A of the QG Omega equation evaluated over the 1000-500 hPa layer [shaded according to the colorbar (10^-12 Pa m^-2 s^-1)]. Warm (cold) colors denote regions of forcing for 700 hPa ascent (descent).
+Image was generated from 1.0x1.0^o NCEP-GFS data smoothed by a Gaussian filter with a weight of 25.