Case Study: 02 - 03 August 1997

• I. Introduction and SatRep Diagnosis for 02 August 1997/06.00 UTC
  • Introduction
  • Overview of satellite imagery for 02 August 06.00 UTC
  • Key parameters on isobaric surfaces for 02 August 06.00 UTC
  • Relative streams and conveyor belts for 02 August 06.00 UTC
• II. Development of Upper Level Low and Rapid Cyclogenesis
  • Introduction for Upper Level Low and Rapid Cyclogenesis
  • Very Short Range Forecast from 02 August 06.00 UTC - 18.00 UTC
  • Development of cloud configurations during Very Short Range Forecast
• III. Diagnosis for 03 August 1997/00.00 UTC
  • Overview of satellite imagery for 03 August 00.00 UTC
  • Key parameters on isobaric surfaces for 03 August 00.00 UTC
  • Relative streams and conveyor belts for 03 August 00.00 UTC
  • Summary
• IV. Diagnosis for 03 August 1997/06.00 UTC
  • Overview of satellite imagery for 03 August 06.00 UTC
  • Key parameters on isobaric surfaces for 03 August 06.00 UTC
• V. Very Short Range Forecast from 03 August 1997/06.00 UTC - 18.00 UTC
  • Introduction for Very Short Range Forecast
  • Development of cloud configurations during Very Short Range Forecast for 03 August 06.00 UTC - 18.00 UTC
  • Diagnosis for 03 August 18.00 UTC with parameters on isentropic surfaces

02 - 03 August 1997 - Overview Of Satellite Imagery For 02 August 06.00 UTC

02 August 1997/06.00 UTC - Meteosat IR image; SatRep overlay: names of conceptual models	02 August 1997/06.00 UTC - Meteosat WV image; SatRep overlay: names of conceptual models
02 August 1997/07.00 UTC - Meteosat VIS image; SatRep overlay: names of conceptual models

The images show the SatRep of this day by means of the identified conceptual models superimposed on all three Meteosat channels. The following conceptual models will be discussed:

• Comma feature (Comma) over Ireland and England:
  This consists of thick multilayered cloudiness with a stripe of very dry air at its rear side (compare Conceptual Models: Comma ).
• Warm Front Shield (WF Shield) west of Ireland:
  The cloud shield is very significant and well-developed in the IR and VIS image and is represented by thick multilayered cloudiness. In the WV imagery the typical warm conveyor belt structure can be detected (compare Conceptual Models: Warm Front Shield ).
• Cold Front in Cold Advection (CF in CA) near the western edge of the image panel:
  In the IR image a cloud band with rather low, warm tops can be noticed; the WV features correspond much more to the warm conveyor belt in the east and to the jet feature in the north (compare Conceptual Models: Cold Front in Cold Advection ).
• Rapid Cyclogenesis (Rapid Cyclogenesis) west of the Warm Front Shield:
  There are some indications from satellite imagery for a Rapid Cyclogenesis taking place:
  • There are two cloud layers, especially a lower one protruding from below a higher one, and
  • In the WV imagery a black dry stripe extends parallel to the edge of the higher cloud system.
  The latter phenomenon is very indicative of a rapid cyclogenesis showing dry sinking air superimposed over the lower cloudiness. In the WV image a spiral structure can even be noticed (compare Conceptual Models: Rapid Cyclogenesis ).