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1000 hPa Height, 1000-500 hPa Thickness, and Thermal Vorticity

Caption:
+1000 hPa geopotential height (solid contours every 30 m).
+1000-500 hPa thickness (dashed contours every 6 dam).
+1000-500 hPa thermal vorticity [shaded according to the colorbar (10^-5 s^-1)].
+Image was generated from 1.0x1.0^o NCEP-GFS data smoothed by a Gaussian filter with a weight of 25.