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700 hPa height (solid contours every 3 dam), 900–500 hPa thickness (dashed contours every 6 dam), and deformation term (C) on RHS of QG Omega equation (shaded in x10-12 Pa m-2 s-1) (Trenberth form).
NCEP GFS analyses and forecasts on 1x1 latitude-longitude grid are smoothed with a 9-point local smoother run 30 times.