1. Swedish Meteorological and Hydrological Institute SE-60176 Norrköping, Sweden
2. Norwegian Meteorological Institute , PO Box 43 Blindern
NO-0313 Oslo, Norway
3. Danish Meteorological Institute , Lyngbyvej 100
DK-2100 Copenhagen Ø, Denmark
4. National Center for Atmospheric Research , PO Box 3000
Boulder, CO 80307-3000 USA
5. European Centre for Medium-range Weather Forecasts, Shinfield Park Reading RG2 9AX UK
6. Icelandic Meteorological Office, Bustadavegur 9 IS-150 Reykjavik, Iceland