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CAPE, DT-850 hPa Shear, 925-850 hPa PSI and Frontogenesis

Caption:
+Convective available potential energy (shaded according to the color bar in J/kg).
+925-850 hPa layer-averaged streamfunction (black contours every 6.0x10⁶ m² s^-1).
+925-850 hPa Petterssen frontogenesis [solid red contours every 0.2 K (100 km)^-1 (3 h)^-1 starting at 0.2 K (100 km)^-1 (3 h)^-1].
+Vertical wind shear between 850 hPa and the dynamic tropopause (2.0 PVU) (standard barbs in knots).
+Image was generated from 1.0x1.0^o NCEP-GFS data.
+The latitude-longitude lines are every 15^o centered on the central point of 30^oN/165^oE.