* U.S. jobless claims fall, supportive for oil
* Dollar dips, spurs risk appetite for commodities
* Coming Up: U.S. preliminary Q2 GDP; 1230 GMT Friday (Recasts, updates prices, market activity, new by-line, changes dateline, previously LONDON)
By Gene Ramos
NEW YORK, Aug 26 (Reuters) - Oil rose for a second day on Thursday, supported by a modest improvement in U.S. jobs data and a weaker dollar.
Oil was up about 1.5 percent past midday, extending a rally from Wednesday after the U.S. Labor Department reported that first-time claims for unemployment benefits fell more than expected last week, though the four-week filings average rose to the highest level since late November.[
]Benchmark U.S. crude futures for October <CLc1> traded at $73.61 per barrel, up $1.09, by 1:30 p.m. EDT (1730 GMT) after reaching a high of $73.98.
ICE Brent <LCOc1> gained $1.67 to $75.15.
Later month contracts gained even more than October, in reaction to bloated inventories, analsyts said.
"The contango is widening and that is a logical reaction to inventories building up so much as it is more economical to store," said Dominick Chirichella, senior partner at Energy Management Institute in New York.
Benchmark crude rose more than 1 percent on Wednesday after touching $70.76, the lowest front-month price since early June, as the market shrugged off data showing U.S. crude and product supplies rose last week to post a new high. [
]The dollar <.DXY> fell against a basket of currencies. A weaker dollar often supports crude, which is priced in the U.S. currency.
"The dollar's weakness is lending support to crude futures today and gains reflect a follow-through from the breakout from 11-week lows yesterday," said Tom Knight, trader at Truman Arnold, in Texarkana, Texas.
"This is a technical bounce after recent weakness (and) an improved cash market in the Gulf Coast, due to ongoing refinery turnarounds, is also helping in this relief rally," he added.
Front-month U.S. crude futures' 14-day relative strength index (RSI) fell to just 30 on Tuesday, a technical pointer to oversold conditions, but has since bounced to around 40, Reuters data showed, partly on profit-taking from short positions.
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For a graphic of the 14-day RSI for U.S. crude:
http://link.reuters.com/fuc57n
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However, oil's two-day gain "has all the hallmarks of an upside correction or retracement in an otherwise falling market," brokers at PVM Oil Associates in London said.
Wall Street turned flat after early gains as enthusiasm from the jobless claims data waned. [
]Markets were also watching central bankers from around the world, gathering at the Jackson Hole, Wyoming, mountain resort to assess the darkening economic outlook.
In a speech scheduled for Friday, U.S. Federal Reserve Chairman Ben Bernanke is likely to discuss the uncertain prospects for the economy, but is not expected to give many clues about whether the Fed will pump more cash into the U.S. economy. [
]Also being awaited, the U.S. government on Friday is expected to revise second-quarter gross domestic product growth lower to an annual pace of 1.4 percent from 2.4 percent, according to a Reuters survey.
The U.S. Energy Information Administration on Wednesday said U.S. crude and product inventories all rose last week. In total, commercial crude and product stocks rose to 1.139 billion barrels, topping the record weekly high of 1.13 billion barrels set in the week to Aug. 13. [
] (Additional reporting by Robert Gibbons in New York; Christopher Johnson in London; Alejandro Barbajosa in Singapore; Editing by David Gregorio)