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1000 hPa Height, 1000-500 hPa Thickness, and RHS Sutcliffe-Petterssen

Caption:
+1000 hPa geopotential height (solid contours every 3 dam).
+1000-500 hPa thickness (dashed contours every 6 dam).
+Total RHS of the Sutcliffe-Petterssen Development theory equation [shaded according to the colorbar (10^-9 s^-2)]. Warm (cold) colors denote regions of 1000 hPa positive (negative) vorticity tendency.
+Image was generated from 1.0x1.0^o NCEP-GFS data smoothed by 20 passes of a 9-point local smoother.