Author
Jarno Schipper - ZAMG
Introduction
This small case study deals with the development of several convective cells in the warm sector in front of a frontal band. This case of convergence becomes interesting due to record amount of precipitation reported in Latvia in the evening of 11th June 2005 (51mm in shy 6 hours) . The development and the onset of this convective event is shown using several MSG channels and RGBs. The mini case studie is further supplemented with a chapter "interactive overlays". In this chapter you can yourself overlay various numerical parameters on the corresponding satellite imagery. Through this interactive way you can reconstruct the case and exercise with it. The case was proposed by the Latvian Meteorological Service to EUMeTrain. If you think you can contribute to this case or to EUMeTrain by providing us dates of interesting case studies which happened in your region of interest, we encourage you to please write us using the above e-mail address.
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Meteosat 8 Enhanced IR10.8 image - 11th July 2005:16 UTC Several convective cells (green and blue) can be seen over Eastern Europe. |
Synoptic situation
From the synoptical chart of June 11th 2005 a frontal system can be observed over Eastern Europe. In the following chapters one can see in the satellite images that in the warm sector of this frontal system several convective cells emerge. These are typical situations in the thickness ridge ahead of Cold Fronts where MCSs develop quickly in the afternoon. In low and middle layers moist warm air is advected from the south or south-west which, together with the drier and colder air at upper levels, leads to potentially unstable stratification of the troposphere.
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| Surface analysis 11th June 2005: 06UTC - Click to enlarge. |
IR Imagery (Meteosat 8 channel 10.8): time sequence
This chapter shows and briefly describes the development in a sequence of hourly images.
Enhanced IR Imagery (Meteosat 8 channel 10.8): time sequence
This chapter shows the enhanced infrared images. This will provide a easier discrimination of the convective cells embedded into the frontal system.
WV Imagery (Meteosat 8 channel 6.2): time sequence
In the following chapter the cloud configurations can be better related to the upper level dynamics using Meteosat 8 - WV6.2 channel.
Meteosat 8 (HRVis + HRVis + IR10.8) - RGB: time sequence
The development and dissolution of new and old convective cells, respectively, are desribed using an artificial RGB which uses the High Resolution Visible channel and IR10.8. The satellite images are each time 1-hour apart.
Meteosat 8 - Airmass RGB: time sequence
The development and especially the physical background is pictured using the Airmass-RGB. The satellite images are each time 1-hour apart.