For a few days a large anticyclone affected much of Europe.
14, November 2020
By Ian MIlls (EUMETSAT)
On 9 April 2015 the high resolution visible (HRV) image at 12:00 UTC (Figure 1) shows mainly clear skies stretching from the UK in the west all the way over to Ukraine in the east.
There are of course some exceptions. On the HRV image there is a large area of cloud stretching from the coasts of Norway and Sweden down the North Sea and through the Channel to the southwest of England. This is mainly fog or low cloud. The Natural Colour RGB image 9 April 2015 at 12:00 UTC (Figure 2) allows us to distinguish between high (cyan) and low cloud (pinkish) showing that most of this cloud over the sea is indeed fog or very low cloud.
On the Natural Colour RGB image we can also see snow (cyan) over the Pyrenees, the Alps, the Carpathians, the Central Apennines and, of course the mountains in Sweden and Norway. On the HRV it is just possible to see a little snow on the highest peaks of the Grampian Mountains in Scotland, but there is also some cloud in this area too. On the natural colour image two tiny dots of cyan colour can be seen in this area showing the snow on the peaks.
The WV6.2 image with the absolute topography at 300 hPa overlaid (ECMWF model) (Figure 3) shows the situation in the upper levels. On the flanks of the anticyclone over central Europe there are two cut-off lows, one over Portugal/Spain the other over Turkey, which together forms a so-called "Omega situation".
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