by ZAMG and KNMI
The surface trough is rather weak in the initial stage and can be found at the leading edge of the Baroclinic Boundary. During development the trough intensifies, depending on the strength of the development.
The existence of a thermal front parameter, mentioned before, marks the biggest change of the thickness gradient, but isolines of thickness never show such pronounced gradients as observed with classical fronts. This is another indication that there is no big difference between the air masses in front of and behind the Cold Air Development (compare Meteorological physical background ).
06 March 2009/00.00 UTC - Meteosat 9 IR10.8 image; magenta: height contours 1000 hPa
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06 March 2009/12.00 UTC - Meteosat 9 IR10.8 image; magenta: height contours 1000 hPa
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06 March 2009/00.00 UTC - Meteosat 9 IR10.8 image; green: height contours 500 hPa
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06 March 2009/12.00 UTC - Meteosat 9 IR10.8 image; green: height contours 500 hPa
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06 March 2009/00.00 UTC - Meteosat 9 IR10.8 image; blue: thermal front parameter 850 hPa, green: thickness 500/1000 hPa
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06 March 2009/12.00 UTC - Meteosat 9 IR10.8 image; blue: thermal front parameter 850 hPa, green: thickness 500/1000 hPa
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06 March 2009/00.00 UTC - Meteosat 9 IR10.8 image; red dashed: Cold Advection red straight Warrm Advection 500/1000 hPa
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06 March 2009/12.00 UTC - Meteoasat 9 IR10.8 image; red dashed line: Cold Advection red line: Warrm Advection 500/1000 hPa
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06 March 2009/00.00 UTC - Meteosat 9 IR10.8 image; yellow: isotachs 300 hPa; red : PVA 300 hPa; Black: Jet axis
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06 March 2009/12.00 UTC - Meteosat 9 IR 10.8 image; Yellow: isotachs 300 hPa; red: PVA 300 hPa; Black: Jet axis
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