500 hPa Pert Vg, Mean ug, and Barotropic Conversion
Caption: +500 hPa zonal mean zonal geostrophic wind component (solid contours every 2 m/s; blue negative; red positive). +500 hPa geostrophic wind perturbation from the zonal mean (barbs in knots). +500 hPa barotropic energy conversion (shaded in x10-2 m2 s-3). +Image was generated from smoothed 1.0x1.0o NCEP-GFS data.