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700 hPa Height, Deformation, and Frontogenesis

Caption:
+700 hPa geopotential height (thin contours every 3 dam).
+700 hPa resultant deformation computed using the nondivergent wind (thick contours every 4.0x10^-5 s^-1 starting at 4.0x10^-5 s^-1).
+700 hPa 2-D Petterssen frontogenesis computed using the nondivergent wind [shaded according to the colorbar in K (1000 km)^-1 (3 h)^-1]. Warm (cold) colors denote regions of 700 hPa frontogenesis (frontolysis).
+Deformation and frontogenesis was computed from 0.5x0.5^o NCEP-GFS data smoothed by 5 passes of a 9-point local smoother. The geopotential height data was not smoothed.