On 27 January 2008, a strong northwesterly flow formed well-developed, low-level waves to the lee of the Ore mountains (also known as Krušné hory or Erzgebirge mountains, on the border between northwest part of the Czech Republic and eastern part of Germany.
08 July 2022
26 January 2008
By Martin Setvak (CHMI)
As the loops of MSG images (below) show, the waves persisted for most of the day, hardly changing their position and extent. In the parts of waves with descending flow the clouds dissipate, forming cloud-free bands. In contrast, the clouds form and persist in those parts of the waves where the air is ascending.
More details can be seen in the images from polar orbiting satellites, like MODIS images (see Aqua MODIS band 1 image at 11:50 UTC (250m resolution) and the corresponding RGB composite (500m resolution, bands 01-04-03)), and AVHRR images (see NOAA-17 image below and NOAA-15 image at 15:17 UTC (night microphysics RGB composite)).
The animations given under 'see also' (e.g. Airmass and Snow RGB products) show that similar mountain waves formed on 27–28 January over most of central Europe — also to the lee of the Small Carpathian Mts. (spreading over Slovakia and Hungary) and in the lee of the Alps and Dinaric Mountains. In addition, stau cloudiness north of the Alps and orographic cirrus related to high-level waves south of the Alps can be observed (the latter best in the Airmass RGB , 00:00–23:45 UTC).
Animation Airmass RGB Composite (00:00–23:45 UTC)
Animation RGB Composite VIS0.8, NIR1.6, IR3.9r (06:30–15:30 UTC)
Animation RGB Composite HRV, HRV, IR10.8 (28 January, 07:00–12:15 UTC)
Aqua MODIS band 1 image at 11:50 UTC (250m resolution)
Aqua MODIS true-colour RGB composite at 11:50 UTC (500m resolution)
NOAA-15 AVHRR night microphys. RGB composite at 15:17 UTC (1.1km resolution)
Lee waves over the Massif Central
High lee wave clouds (type 2) formed in the lee of the Massif Central on 20 February 2002.
Widespread lee waves over southern Europe
Using a combination of Meteosat satellite data experts were able to to pinpoint lee waves over Southern Europe and the Mediterranean Sea in February 2016.
Lee and gravity waves above the Czech Republic
The Meteosat-8 image below shows two types of waves above the Czech Republic, interfering with each other.