That is a local weather effect most likely caused by a shift in prevailing wind and ocean currents. Anyway, it says next to nothing about global temperatures.

Oddly enough several models demonstrate a possible cooling of northern Europe as a result of global worming. But, I think it's a stretch to suggest we can predict regional weather patterns with that level of accuracy over the long term.

PS: Magnitude of change is much harder to predict than direction of change and you need an accurate prediction of magnitude before you can understand the interactions of local weather patterns. Local weather is an extremely complex problem involving everything from http://en.wikipedia.org/wiki/Coriolis_effect, ocean currents, to the shape of the local, regional and global land masses etc.