High-level clouds over mountains. Credit: bennian_1

High-level wave clouds over the Andes mountains

1 June 2007 08:45 UTC

High-level clouds over mountains. Credit: bennian_1
High-level clouds over mountains. Credit: bennian_1

The Meteosat-8 images below show a case of stationary, high-level wave clouds over Argentina, Paraguay, Bolivia and Brazil produced by the Andes mountains during a situation of strong westerly winds in June 2007..

Last Updated

25 May 2022

Published on

01 June 2007

By Jochen Kerkmann, Jose Prieto and HansPeter Roesli (EUMETSAT)

It should be noted that the Andes mountains are located very close to the limit of the Meteosat-9 field of view.

Typically, during such a situation strong foehn winds can occur on the eastern slope of the Andes, also called 'zonda' winds (in Spanish, viento zonda).

As can be seen in the bottom image, the wave clouds extend extremely far downstream over the South Atlantic. A reason for this could be the existance of very small ice particles which can stay up in the air a very long time without sublimating or fall out. More information about wave clouds over the Andes can be found in the case study from 29 June 2005 (High-level wave clouds over the Andes) .

Met-9, 01 June 2007, 09:00 UTC
Figure 1: Meteosat-9 RGB Composite (24-hour Cloud Microphysics) IR12.0–IR10.8, IR10.8–IR8.7, IR10.8, 1 June 2007, 09:00 UTC
Met-9, 01 June 2007, 09:00 UTC
Figure 2: Meteosat-9 Airmass RGB, WV6.2–WV7.3, IR9.7–IR10.8, WV6.2, 1 June 2007, 09:00 UTC
High-level wave clouds over the Andes Mountains
Figure 3: Meteosat-9 RGB Composite (24-hour Dust Microphysics)
IR12.0–IR10.8, IR10.8–IR8.7, IR10.8, 1 June 2007, 08:45 UTC

Animation (satellite projection) (00:00–08:45 UTC)
Animation (reprojected) (00:00–08:45 UTC)