You never heard of a snow hurricane before because there's no such thing. Typical media hype!
There is nothing unusual about snow in winter in Japan Korea or China. Vast continental landmasses cool dramatically in Winter, and the prevailing winds in Japan or Korea tend to blow off the freezing interior of China/Russia/Siberia.
Spain is the most mountainous country in Europe, with a vast plateau interior. Snow is very common there in Winter, contrary to popular belief. Arizona and Nevada are also high altitude.
I would love to believe the gulf stream was disappearing, I love snow, but the current
sea surface temperature anomalies suggest nothing of the sort.
The waters around Britain and Ireland are colder than normal, due to the prolonged cold spell of weather, but to the west northwest, and north the ocean temps are still above normal.