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CAPE, 950-500 hPa vertical shear, and 700-500 hPa lapse rate

Caption:
+700-500 hPa lapse rate (contours every 1 K/km).
+950-500 hPa vertical shear (standard barbs in knots).
+Convective available potential energy (shaded according to the color bar in J/kg).
+Fields are computed from the 0.5x0.5^o NCEP-GFS data.