Typical Appearance In Vertical Cross Sections

  • Isentropes are inclined, but less pronounced than for fronts; sometimes there is a double structure (frontal character at the surface and above)
  • Often within weak WA
  • Convergence in lower levels, sometimes in upper levels, but there are big differences from case to case
  • Isotachs show a low level minimum at the transition between the Occlusion and Convergence Cloudiness

20 December 2008/18.00 UTC - Vertical cross section; black: isentropes (ThetaE), red thick: temperature advection - WA, red thin: temperature advection - CA, orange thin: IR pixel values, orange thick: WV pixel values

20 December 2008/18.00 UTC - Vertical cross section; black: isentropes (ThetaE), magenta thick: convergence, magenta thin: divergence, orange thin: IR pixel values, orange thick: WV pixel values