* Wal-Mart forecasts Q4 earnings could miss estimates

* Weekly jobless claims fall for second week in a row

* For up-to-the-minute market news, click [STXNEWS/US]

(Updates with jobless claims, quote)

By Angela Moon

NEW YORK, Nov 12 (Reuters) - Wall Street was set to open lower on Thursday as a weak holiday quarter forecast from retail giant Wal-Mart Stores Inc (WMT.N: Quote, Profile, Research) sparked concerns about consumer spending, threatening to break a six-session rally for the Dow.

The comments from Wal-Mart offset data that showed the number of U.S. workers filing new claims for jobless insurance fell for the second week in a row, with the four-week moving average of claims the lowest in nearly a year. For details, see [ID:nN11377609]

"The (disappointing) outlook from Wal-Mart does not bode well for the overall view on consumer spending," said Tom Schrader, managing director of U.S. equity trading at Stifel Nicolaus Capital Markets in Baltimore.