Imaggeo On Monday: The sudden stratospheric warming on February 12, 2018

Imaggeo On Monday: The sudden stratospheric warming on February 12, 2018
The image captures an atmospheric extreme event, a so-called sudden stratospheric warming (SSW) that occurred on Feb. 12, 2018. It is visualized through potential vorticity above the North Pole at the 10hPa level (~30km) above the Earth’s surface and consists of a split of the winter polar vortex into two separate vortices that interact with each other. Although the events are not predictable more than a few days in advance due to their complex dynamical behavior, these rare events can have long-lasting impacts on the weather at the surface and can lead to persistent cold spells over Europe. This makes them an important puzzle piece for long-range weather forecasting. There is an ongoing international debate about potential changes in frequency of SSW events with climate change that could have significant impacts on future changes in winter weather for Europe.


Description by Daniela Domeisen, after the description on


Imaggeo is the EGU’s online open access geosciences image repository. All geoscientists (and others) can submit their photographs and videos to this repository and, since it is open access, these images can be used for free by scientists for their presentations or publications, by educators and the general public, and some images can even be used freely for commercial purposes. Photographers also retain full rights of use, as Imaggeo images are licensed and distributed by the EGU under a Creative Commons licence. Submit your photos at

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