Typical Appearance In Vertical Cross Sections

16 February 2015/12 UTC - Meteosat IR 10.8 image; position of vertical cross section indicated

  • Thetae
    Thetae decreases down the slope.
  • Temperature advection
    The cold advection above the slope is very strong up to the mid-troposphere.
  • Relative humidity
    The airstream down the slope is very dry, with values of relative humidity even below 10 %.
  • Divergence
    A strong zone of convergence forms above the slope, followed by an area of divergence to counterbalance the vertical motions.
  • Vertical motion (omega)
    The descending motion above the slope is prominent.
  • Isotachs
    There is a wind maxima over the deepest part of the slope. In case of an occlusion also a jet core is situated near the tropopause.

Temperature Advection

16 February 2015/12 UTC - vertical cross section; black: isentropes (Θe), blue: cold advection, red: warm advection

Relative Humidity

16 February 2015/12 UTC - vertical cross section; black: isentropes (Θe), green: relative humidity > 69 %, yellow: relative humidity < 70 %

Divergence

16 February 2015/12 UTC - vertical cross section; black: isentropes (Θe), solid red line: convergence, dashed red line: divergence

Omega

16 February 2015/12 UTC - vertical cross section; black: isentropes (Θe), solid cyan line: ascend, dashed cyan line: descent

Isotachs

16 February 2015/12 UTC - vertical cross section; black: isentropes (Θe), light brown: isotachs from 30 m/s up in 10 m/s intervals