Weakening economic conditions will come together in 2013 and create a "perfect storm" of global weakness, economist Nouriel Roubini told CNBC.
Known for his generally dour outlook that helped him see the financial crisis before it hit in 2008, Roubini said the US, European nations and others have become adept enough at forestalling their problems that a true crisis won't hit until 2013.
But when it does, the effects are likely to be painful.
