Convective storm with marked gust front over Darmstadt.
More information and detailed analysis of the feature can be found in the In Depth section.
by Jochen Kerkmann and Gordon Bridge (EUMETSAT)
On 29 June 2005 a line of convective storms crossed The Netherlands and Germany causing widespread wind and rain damage. The convective storms can be seen on the HRV image below (upper right) as the highly reflective clouds over western Germany with a V-type storm on the southern edge (see image interpretation below the image).
The latter storm reached Darmstadt around 19:00 UTC where it caused strong winds and one hour of heavy rain (in total around 50 mm of rain). The picture below the satellite images shows the arrival of the gust front (convective outflow boundary) in Darmstadt as observed from the ground. It shows the typical roll cloud (or shelf cloud), which marks the limit between the warmer pre-storm air and the cooler air produced by the outflow of the storm.
Concerning the RGB composite used to monitor severe convective storms (see lower right image), the storm over Darmstadt, although quite severe, did not appear with a yellowish colour (indicating small ice particles, see MSG Interpretation Guide). In fact, small ice particles at the top of convective clouds (especially in the early stage of development) are a typical sign of strong updrafts/downdrafts.
However, not all severe convective storms contain small ice particles, other features, like storm top temperature, storm texture, storm growth and storm movement are also very important for the interpretation of the severity of a convective storm.
Channel 09 (IR10.8, colour enhanced)
Full Resolution (773 KB)
Animation (09:15–14:15 UTC, MP4, 4 MB)
Channel 12 (HRV)
Full Resolution (548 KB)
Image Interpretation (548 KB)
Severe thunderstorm development over KwaZulu-Natal, South Africa (3 January 2005)
Severe convective storms over Poland, Austria and the Czech Republic (30 May 2005)
Severe convective storms over Romania (31 May 2005)
Major thunderstorm hits Western Switzerland (18 July 2005)
Absolute topography 300 hPa (29 June 2005, 12:00 UTC, PNG, 60 KB, source: DWD)
Relative topography 500/1000 hPa (29 June 2005, 12:00 UTC, PNG, 62 KB, source: DWD)
Radiosounding of Stuttgart (29 June 2005, 12:00 UTC, PNG, 12 KB, source: DWD)
Weather radar image (29 June 2005, 19:00 UTC, GIF, 78 KB, source: DWD)
RGB Composite NIR1.6, VIS0.8, VIS0.6
Full Resolution (788 KB)
WV6.2–WV7.3, IR3.9–IR10.8, NIR1.6–VIS0.6
Full Resolution (906 KB)