Well, we're getting some of that today, just like they promised. It seem to have something to do with factories pumping steam into the air, and a weather inversion.
If you read German, here are a couple of pages on the topic:
http://www.swisswetter.ch/aktuell/20020111-industrieschnee.htm
http://www.linz.at/Umwelt/umwelt_11028.asp