I vote #1 for Scandinavia. Norway's very long and jagged coast pierced all along with long fjords surrounded by complex mounains, makes it some of the most difficult areas in the world to forecast. This is also why Norwegian meterological institute is one of the most regarded forecasters. Check out www.yr.no
Which models they use I don't know, but better forecasting of Scandinavia and especially Western parts is highly needed