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Dt Theta, Wind, and 925-850 hPa Vorticity

Caption:
+DT potential temperature (shaded according to the color bar in K).
+DT wind (standard barbs in knots).
+925-850 hPa vertically-averaged relative vorticity (solid contours every 5.0x10^-5 s^-1 starting at 5.0x10^-5 s^-1).
+Fields are computed from the 0.5x0.5^o NCEP-GFS data.