Instant Occlusion - Typical Appearance In Vertical Cross Sections
by ZAMG and FMI
- Isentropes:
The typical downward inclined crowding zone with the Cold Front, potentially unstable stratification in the lower troposphere in the Comma area - PVA:
Maxima in the frontal zone increasing with height, a weaker maximum in the comma area. - Divergence:
In the frontal zone convergence on the lower and middle levels, divergence above. In the Comma area convergence on the low layers, divergence on the middle layers. - Omega:
Upward motion in the frontal zone and in the Comma area in lower and middle troposphere.
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12 January 2007/06.00 UTC - Meteosat IR image; position of vertical cross section indicated
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15 January 2007/06.00 UTC - Vertical cross section; black: isentropes
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15 January 2007/06.00 UTC - Vertical cross section; black: isentropes, green: positive vorticity advection
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15 January 2007/06.00 UTC - Vertical cross section; black: isentropes, magenta thick: convergence, magenta thin: divergence
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15 January 2007/06.00 UTC - Vertical cross section; black: isentropes, cyan: upward motion
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