Hold on tight and look out below!

Things are really beginning to look glum in the housing markets:

NEW YORK (Reuters) - There is a "substantial" risk that U.S. home prices will slide for the next three years or more, in a downturn that could be unlike anything seen before on a national level, Morgan Stanley said on Thursday in a report.

Price levels of the RPX Index, a derivative index based on home prices in 25 U.S. metropolitan residential property markets, indicate an expectation that prices will decline for the next three years, with a recovery likely to occur between three and four years from now, Morgan Stanley said.

That's 2011 folks!