In the WV6.2 image the warm frontal area is the most striking feature; cold front is seen as a narrow line extending from Latvia further east. A very dark stripe is approaching from the northern parts of Ukraine.
The very dark stripe has moved towards north; strong gradient in greyshade pixels can be seen across Belarussia at this time.
Developing low pressure is seen strikingly clear in water vapour images. The dark stripe has increased in size and extends now as far as to the centre of the low pressure. Some convective cells can be seen protruding from the frontal band over Estonia and over the border between Russia and Finland.
Frontal analysis 09 August 2005/12 UTC |
The water vapour spiral associated with the occlusion develops. The MCS and cold front band are now very clearly seen over southern Finland.
The water vapour spiral continues to develop and is curling around the upper vortex centre in the Baltic States now.
Smaller scale vortices (seen as undulating edges within the occlusion spiral) start to develop. Very intensive white colours indicating deep tropospheric moisture content can be seen in the south-western flank of the occlusion spiral.
Smaller scale vortices within the occlusion cloudiness become more apparent and move cyclonically around the low pressure.
Frontal analysis 10 August 2005/12 UTC |
Small scale water vapour vortices appear at many places over Scandinavia within the main large-scale vortex.
Cut-off process is seen as moist bands on both sides of the upper level low. Lot of small scale vortices appear in Scandinavia. A new developing system can be seen in the easternmost part of the image.
The cut-off process is becoming complete; and a continuous ring of water vapour bands surround the low pressure.
The cut-off process is now complete and a continuous ring of water vapour bands surround the low pressure. The system to the east has further developed into an Occlusion. The location of the centre of surface low between 8 and 12 August is shown with grey "L" letters.
Frontal analysis 11 August 2005/12 UTC |
The cut-off low is now stationary west of Finland. The water vapour signal associated with the occlusion cloud spiral is becoming more diffuse.