Home prices fell 0.2% in November on a seasonally adjusted basis after leveling off in October, suggesting the housing market has lost momentum and values could decline over the winter months, according to the Standard & Poor's/Case-Shiller 20-city price index.

"On balance, while these data do show that home prices are far more stable than they were a year ago, there is no clear sign of a sustained, broad-based recovery," said David Blitzer, chairman of S&P's index committee.

Until October, the HPI registered four consecutive months of house price increases. But for 2009 through the month of November, the HPI is down 2.8%.

S&P's Chief Economist David Wyss expects home sales will drop over the winter and house prices could fall 8% based on the 20-city HPI.

Separately, the Federal Housing Finance Agency (FHFA) reported that its seasonally adjusted HPI — based on Fannie Mae and Freddie Mac purchase mortgage transactions — rose 0.7% in November from October.

r the 12 months ending in November, the FHFA HPI is up 0.5%.

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