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1000 hPa Height, 1000-500 hPa Thickness, and Term A Sutcliffe

Caption:
+1000 hPa geopotential height (solid contours every 30 m).
+1000-500 hPa thickness (dashed contours every 6 dam).
+Term A of the Sutcliffe Development theory equation [shaded according to the colorbar (10^-5 s^-1)]. Warm (cold) colors denote regions of 1000 hPa convergence (divergence) in the Northern Hemisphere.
+Image was generated from 1.0x1.0^o NCEP-GFS data smoothed by a Gaussian filter with a weight of 25.