Cold Front In Warm Advection - Key Parameters

by ZAMG and FMI

In this chapter the key parameters of Cold Front in Warm Advection (over Belarus and Poland) are described and compared to the corresponding parameters of a Cold Front (over Scotland).

Positive vorticity advection at 500 hPa and temperature advection at 700 hPa:

In a CF in WA there is a maximum of PVA over the rear edge of the cloud band.
In a CF the maximum of PVA is equally distributed, but remarkably stronger.
In a CF in WA the cloud band is wholly under weak warm advection; some warm advection is also ahead of the front. Behind the front there is usually very little temperature advection.
in a CF there is warm advection ahead of the cloud band and strong cold advection behind it. The cloud band is mostly under cold advection.

	03 October 2006/12.00 UTC - Meteosat 8 IR 10.8 image; green: PVA 500 hPa, red: temperature advection 700 hPa


	19 September 2005/12.00 UTC - Meteosat 8 IR 10.8 image; green: PVA 500 hPA, red: temperature advection 700 hPa

Thermal frontal parameter and equivalent thickness:

TFP accompanies the cloud band in both cases, although in CF in WA it is weaker.
Equivalent thickness shows a crowding zone near the rear edge of the cloud band, and a ridge ahead of it.

	03 October 2006/12.00 UTC - Meteosat 8 IR 10.8 image; blue: TFP, green: equivalent thickness


	19 September 2005/12.00 UTC - Meteosat 8 IR 10.8 image; blue: TFP, green: equivalent thickness

Shear vorticity and wind at 300 hPa:

The zero line of shear vorticity follows the rear edge of the cloud band and coincides the jet stream.

	03 October 2006/12.00 UTC - Meteosat 8 IR 10.8 image; magenta: zero line of shear vorticity 300 hPa, yellow: isotachs 300 hPa


	19 September 2005/12.00 UTC - Meteosat 8 IR 10.8 image; magenta: zero line of shear vorticity 300 hPa, yellow: isotachs 300 hPa

Menu Of Cold Front In Warm Advection

Meteorological Physical Background

Typical Appearance In Vertical Cross Sections