ROUBINI STILL WORRIES

RGE MONITOR--The "mother of all carry trades" that Nouriel Roubini warned of recently is growing and threatening to cause a global implosion, the economist warned in a CNBC interview.

For the second time in as many weeks, Roubini cautioned that investors using cheap US dollars to embrace risk will quickly reverse course once the greenback strengthens.

But he intensified his prediction, saying that the likelihood of the Fed keeping interest rates low and thus weakening the dollar will prolong the carry trade and make it all the more painful when it starts to unwind. Roubini is an economist at New York University and chairman of RGE Monitor.

"Eventually there's going to be an end to this carry trade," he said in an interview. "When that snapback of the dollar is going occur it's not going to be 2 percent or 3 percent, it's going to be more like 25 or 20 percent. And then everybody will have to close their shorts on the dollar, they'll have to sell these risky assets across the world and you could have this huge asset bubble going into an asset bust."