Geopotential height and Equivalent Potential Temperature at 850 hPa
9 Aug 2005/00 UTC - Meteosat 8 IR10.8; Geopotential Height 850 hPa (solid brown), equivalent potential temperature (pink).
The fronts are seen well in equivalent temperature fields: the cold front extends from Krimean peninsula towards the northern parts of Ukraine. The Warm front is also well identifiable and extends from northern parts of Belarussia to Scandinavia.
9 Aug 2005/12 UTC - Meteosat 8 IR10.8; Geopotential Height 850 hPa (solid brown), equivalent potential temperature (pink).
The cold front is very well developed: the frontal cloudiness is located at the leading edge of the front (the location of the front can be seen as tight gradient in ThetaE). Occlusion process is about to begin: a clear seccluded pocket of warm air at lower levels of troposphere can be seen in Lithuania.
10 Aug 2005/00 UTC - Meteosat 8 IR10.8; Geopotential Height 850 hPa (solid brown), equivalent potential temperature (pink).
The Cold front has passed southern Finland, convective cloudiness can be seen ahead of the front. Occlusion process continues and the tongue of warm aír penetrates from the southern Baltic eastwards over Lithuania to western parts of Russia.
10 Aug 2005/12 UTC - Meteosat 8 IR10.8; Geopotential Height 850 hPa (solid brown), equivalent potential temperature (pink).
The occlusion process is complete, and the warm tongue making almost a full circle around the cut-off low.
11 Aug 2005/00 UTC - Meteosat 8 IR10.8; Geopotential Height 850 hPa (solid brown), equivalent potential temperature (pink).
The frontal structure is gradually weakening, but the cloudiness remains almost stationary especially at the Lithuanian coast.
11 Aug 2005/12 UTC - Meteosat 8 IR10.8; Geopotential Height 850 hPa (solid brown), equivalent potential temperature (pink).