1. Development Centre for Weather Forecasting, Norwegian Meteorological Institute, Oslo, Norway
2. Department of Physics and Technology, University of Tromsø, Tromsø, Norway
3. Department of Physics, University of Potsdam, Potsdam, Germany
4. Department of Physical Geography, Utrecht University, Utrecht, The Netherlands
5. Forecasting Department, Norwegian Meteorological Institute, Tromsø, Norway
6. Department of Arctic Geophysics, The University Centre in Svalbard, Longyearbyen, Norway
7. Geophysical Institute, The University of Bergen, Bergen, Norway