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Stock gains fade after morning rebound

A U.S. stock rally fizzled on Tuesday, with losses piling up in the final 30 minutes of trade to extend a three-day rout that pushed financial indices into corrections.

"We entered 2015 with valuations pretty stretched, and we've got decelerating earnings -- that leaves the market vulnerable to any negative news," Bruce Bittles, chief investment strategist at RW Baird & Co., said of the sharp declines in recent days. "The U.S. economy is growing about 2.25 percent in GDP -- that's been the case for the past five years. The problem with slow growth is you're more vulnerable to an outside shock."

After a three-day plunge left the Dow industrials and S&P 500 in correction modes, or down 10 percent from spring highs, benchmark indices waged a comeback that dissipated as the final bell approached. The Dow (DJI) fell 205 points, or 1.3 percent, to 15,666. The S&P 500 (spx) lost nearly 26 points, or 1.4 percent, to 1,868. The Nasdaq Composite (comp) declined 20 points, or 0.4 percent, to 4,506.

Sell-off triggers roller coaster day for stocks

"It's hard for people to separate what's going on in the Chinese economy from the Chinese stock market," said Art Hogan, chief market strategist with Wunderlich Securities. "The U.S. stock market is larger than our GDP. China's stock market is about 10 percent of the Chinese economy. The Chinese stock market is new, speculative, and the average holding is 20 days."

China's stock woes don't reflect on U.S. stock markets, nor does a slowing Chinese economy translate into trouble for the U.S. economy, Gus Faucher, senior economist at PNC Financial Services Group, told CBS MoneyWatch. "The concern is more if there is a financial crisis in China," he said.

China's slowing economy does hurt U.S. corporations that export to China, and its devalued currency does make U.S. products less competitive versus Chinese products. U.S. exports to China only represent a fraction of economic growth.

"We're talking maybe a 10th of a percentage point of U.S. GDP in a year," Faucher said of the potential impact of China's troubles on the U.S. economy.

On Monday, U.S. stocks took it on the chin for a third consecutive session, with turmoil in China's market exacerbating concerns about the global economy.

Market drop spurred by China concerns

"We think this turmoil is temporary. We've had a bull market for six years, and large gains in equity prices in that time. It's normal to see this type of correction," Faucher said. "The fundamentals for the U.S. economy continue to look very good -- we have solid gains in consumer spending, a housing market that is recovering, and we're adding 200,000 jobs a month."

Economic reports released Tuesday bolstered that view. Data had new-home sales bouncing back in July, while a separate report showed consumer confidence rising more than projected in August.

The market is currently pricing in odds of a September rate increase by the Federal Reserve at one in four.

On Monday, Fed Bank of Atlanta President Dennis Lockhart said that while he continues to anticipate a Fed hike this year, the first such move since 2006 could be problematic given the stronger dollar, the weaker Chinese yuan and the declining price of oil.

Uncertainty about the timing of the Fed's move is bolstering market volatility, market analysts say.

"There will be more volatility in the near term until the Fed's outlook becomes clearer," Faucher said.