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1000 hPa height (black contours every 3 dam), 500 hPa height (green contours every 6 dam), and absolute vorticity advection term (A) on RHS of Petterssen Development equation (shaded in x10-9 s-2).
CMC GDPS analyses and forecasts on .6x.6 latitude-longitude grid are smoothed with a 9-point local smoother run 80 times.