* Stocks fall as jobs news underscores depth of recession
* Dollar falls after weaker-than-expected ADP report
* Crude oil slides in largest percentage drop in 7 years
* Concern over raft of new debt supply again hits bonds (Adds close of U.S. markets)
By Herbert Lash
NEW YORK, Jan 7 (Reuters) - U.S. stocks fell about 3 percent and oil prices plunged the most in seven years on Wednesday after surprisingly large job losses and a sharp rise in crude inventories reminded investors that the U.S. economy still faces stiff head winds.
The dollar fell, reversing sharp gains against the euro and yen earlier this week, as the steep job losses in the U.S. private sector reignited fears of a deep recession.
A disappointing revenue outlook from technology bellwether Intel Corp <INTC.O> and Alcoa Inc's <AA.N> plans to cut more than 15,000 jobs, halve capital spending and sell businesses also heightened concerns about the severity of the recession.
While separate data showed planned layoffs at U.S. firms eased in December from the previous month's seven-year high, they were still up 275 percent annually as the 12-month-old recession cuts a wide swathe through the U.S. economy.
But a report from ADP Employer Services that said U.S. private employers shed a more-than-expected 693,000 jobs in December, up from a revised 476,000 jobs lost the previous month, sent the most shivers through financial markets, also helping to drive down European stock markets on fears about the global economy.
The ADP report foreshadows likely grim employment data for December from the U.S. Labor Department on Friday and underscored the challenges facing President-elect Barack Obama to revive the economy with a $775 billion stimulus package.
"The ADP report reinforces the view that things could get worse than expected and we're already expecting a long period of weakness," said Meg Browne, a currency strategist, at Brown Brothers Harriman in New York.
Recession fears were heightened after Intel, the world's biggest maker of semiconductor chips, issued its second revenue warning for the fourth quarter since November, citing weakening demand for personal computers.
Intel was among the main laggards on the Nasdaq, falling 6.1 percent to $14.44, while top U.S. aluminum maker Alcoa slid 10.2 percent to $10.89.
"It all of a sudden hit everyone that it's preannouncement season and it's impossible to forecast in a recession," said Tim Ghriskey, chief investment officer of Solaris Asset Management in Bedford Hills, New York. "When reality hits it can shock people."
The Dow Jones industrial average <
> fell 245.16 points, or 2.72 percent, at 8,769.94. The Standard & Poor's 500 Index <.SPX> slid 28.05 points, or 3.00 percent, at 906.65. The Nasdaq Composite Index < > lost 53.32 points, or 3.23 percent, at 1,599.06.European shares ended lower, snapping a six-day winning streak, as the weak U.S. employment data weighed on sentiment and commodity stocks were hit by lower crude and metal prices.
The pan-European FTSEurofirst 300 <
> index of top European shares closed down 1.3 percent at 877.85.Oil prices slid 12 percent, the largest percentage drop since 2001, after the U.S. Energy Information Administration reported a much greater-than-expected rise in crude inventories, in a sign of weakening demand amid the global economic slowdown.
Crude oil stocks swelled by 6.7 million barrels, more than seven times the 900,000-barrel increase analysts had expected.
Gasoline and distillate stocks also rose as refinery utilization climbed and demand remained sluggish.
U.S. crude for February delivery <CLc1> settled at $42.63 a barrel, down $5.95, in the biggest single-day percentage drop since prices plunged 15.25 percent on Sept. 24, 2001.
"This is a very bearish report. Crude stocks are up due to higher imports," said Tom Knight, a trader at Truman Arnold in Texarkana, Texas. "The build in products is also bearish."
The dollar fell against a basket of major currencies, with the U.S. Dollar Index <.DXY> down 0.69 percent at 82.25. Against the yen, the dollar <JPY=> fell 1.08 percent at 92.65.
The euro <EUR=> rose 0.87 percent at $1.3624.
U.S. Treasury debt prices fell amid renewed concerns that a spate of new debt supply will dilute the market, despite more evidence of a dire U.S. employment backdrop.
A total of $166 billion of new government debt supply is on tap this week, with more expected in order to help feed various programs intended to prop up the economy. The size of this week's issuance is the third largest ever.
Investors fear the huge doses of new debt issuance will boost Treasury note yields, which move inversely to prices and which remain not far off 50-year lows.
The benchmark 10-year U.S. Treasury note <US10YT=RR> fell 7/32 in price to yield 2.48 percent. The 30-year U.S. Treasury bond <US30YT=RR> fell 25/32 in price to yield 3.04 percent.
Gold dropped nearly 3 percent to a two-week low as the worsening job data dashed hopes of an inflation-driven gold rally in the near term.
Gold for February delivery <GCG9> settled down $24.30 to $841.70 an ounce in New York.
The MSCI index of Asia-Pacific stocks outside Japan <.MIAPJ0000PUS> rose 0.5 percent, on track for an eighth consecutive session of gains, before turning negative on the ADP report.
Japan's Nikkei share average <
> rose 1.7 percent. (Reporting by Ellis Mnyandu, Gertrude Chavez-Dreyfuss, Chris Reese and Frank Tang in New York and Alex Lawler and Joanne Frearson in London; writing by Herbert Lash, Editing by Leslie Adler)