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700 hPa height (solid contours every 3 dam), 900–500 hPa thickness (dashed contours every 6 dam), and planetary vorticity advection by the thermal wind term (B) on RHS of QG Omega equation (shaded in x10-12 Pa m-2 s-1) (Trenberth form).
CMC GDPS analyses and forecasts on .6x.6 latitude-longitude grid are smoothed with a 9-point local smoother run 80 times.