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500 hPa Height, QGPV, and Wind

Caption:
+500 hPa geopotential height (solid contours every 6 dam).
+500 hPa wind (half barb=2.5 m s^-1; full barb=5.0 m s^-1; pennant=25.0 m s^-1).
+500 hPa quasi-geostrophic potential vorticity (QGPV) [shaded according to the colorbar in potential vorticity units(PVU)].
+Image was generated from 1.0x1.0^o NCEP-GFS data (unsmoothed).