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These 210 housing markets are now vulnerable to 20%-25% home price declines, finds latest Moody's downgrade

Favorable millennial demographics. Tight housing inventory. Low unemployment. That's why housing bulls said the Pandemic Housing Boom had more room to run.

Moody's Analytics chief economist Mark Zandi, of course, disagreed. Back in May, Zandi came to Fortune with a bold proclamation: The Pandemic Housing Boom had peaked and we were entering into a "housing correction." A housing correction being a period where the housing market—which got priced to 3% mortgage rates—would work towards equilibrium. It'd see home sales volumes fall sharply. It'd also, Zandi said, put much of the nation at risk of a home price corrections.

Fast forward to September, and it looks like Zandi's housing correction call was spot-on. Not only is housing activity declining across the board, but some markets, like Austin and Boise, are already seeing falling home prices. This week, Fed Chair Jerome Powell acknowledged that the U.S. housing market is entering into a "difficult correction."

That said, Zandi's views are shifting—downward. In August, Moody's Analytics downgraded their U.S. housing market outlook. Peak-to-trough, Moody's Analytics expected U.S. home prices to fall between 0% to 5%, and fall between 5% to 10% in significantly "overvalued" housing markets. That August forecast assumed no recession. If an economic downturn manifested, Moody's Analytics expected U.S. home prices to fall between 5% to 10%. While significantly "overvalued" housing markets would fall 15% to 20%.

Just a month later, Moody's Analytics is already revising that bearish housing market outlook downward.

Peak-to-trough, Moody's Analytics now expects U.S. home prices to fall between 5% to 10%. In significantly "overvalued" housing markets, that forecasted drop is now between 10% to 15%. If a recession hits, Moody's Analytics expects that U.S. home price decline to widen to 10% to 15%, and the drop in significantly "overvalued" housing markets to range between 20% to 25%.

Let's say that U.S. home prices decline 15%. That hypothetical drop wouldn't fully erase the staggering 43% jump in U.S. home prices we saw during the Pandemic Housing Boom. However, it would be the second biggest home price decline of the post-World War II era. Only the bursting housing bubble, which saw U.S. home prices decline 27% between 2006 and 2012, would have it beat.

If U.S. home prices do indeed fall by a double-digit amount, Fortune would relabel the Pandemic Housing Boom to the Pandemic Housing Bubble.