18th August 2004: 12UTC
West of Paris ("P") high extending clouds can be seen. At the eastern edge of the developing squall line a cirrus shield can be recognised.
18th August 2004: 13UTC
The HRV image exhibits compact cloud structures. However, due to the relative high solar angle it is difficult to see detailed structures (e.g. overshooting tops).
18th August 2004: 14UTC
At 14 UTC we can see, around Paris and further to the east, structured convective cells that were embedded in the frontal band. At its eastern edge relatively compact cirrus clouds existed. Further to the east small convective cells developed.
18th August 2004: 15UTC
With decreasing solar angle we can see the structures south of Brussels ("B") more clearly. The rough texture indicates that the most intense convection occurred in that area. This is confirmed by other data, e.g., lightning, (considered in another sub-chapter.)
18th August 2004: 16UTC
The rough structure due to shadows of high cloud tops (southeast of Brussels and Paris) indicates deep convection.
18th August 2004: 17UTC
In this image we can see the squall line along about 6°E, forming east of Brussels.
18th August 2004: 18UTC
Near the terminator southeast of Brussels and between 6 and 7°E we can see a high extending convective cell. Its shadow indicates the overshooting tops.
