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1000 hPa height (solid contours every 3 dam), 1000–500 hPa thermal vorticity (shaded in x10-5 s-1), and 1000–500 hPa thickness (dashed contours every 6 dam).
CMC GDPS analyses and forecasts on .6x.6 latitude-longitude grid are smoothed with a 9-point local smoother run 80 times.