* U.S. stocks turn negative, weigh on oil
* Dollar bounces up after early weakness, weighs on oil
* Tropical storm forms, not expected to hit Gulf of Mexico
* Coming up: API oil inventory data, Tues, 4:30 p.m. EDT (Recasts, updates prices, market activity, changes byline and moves dateline from previous LONDON)
By Robert Gibbons
NEW YORK, Aug 23 (Reuters) - Oil futures prices fell to a six-week low on Monday, turning negative as Wall Street slipped after a higher open and weighed down by the dollar's strength after the currency also bounced.
Lingering concerns about the economy, bulging U.S. stockpiles and spare capacity from producers kept pressuring the market after prices declined last week.
U.S. crude for October delivery <CLc1> fell 82 cents, or 1.11 percent to $73 a barrel by 12:19 p.m. EDT (1619 GMT), having traded from $72.80 to $74.48. That intraday low was the lowest since prices fell to $71.44 on July 7.
October Brent crude <LCOc1> fell 77 cents to $73.49.
"Oil was trying to get traction early with the (higher) stock market this morning. But the time of year and the oversupply are weighing on the market," said Phil Flynn, analyst at PFGBest Research in Chicago.
The U.S. summer driving demand season is nearing its end and the calendar is moving into the "shoulder" season between summer driving demand and the winter heating season.
U.S. stocks fell after a higher open, pulled lower by technology shares and Hewlett-Packard Co's <HPQ.N> weakness after it launched a bid for 3PAR Inc <PAR.N>. Lingering concerns about economic growth also weighed on stocks. [
]The euro <EUR=> extended declines versus the U.S. dollar, falling through support at the euro's 55-day simple moving average level. The dollar index strengthened <.DXY> after being weaker earlier.
A stronger dollar can pressure oil prices as money shifts out of more risky commodities and also because countries with other currencies must pay more for dollar-denominated oil.
Oil prices were pushed lower by last week's economic reports that included data showing U.S. jobless claims hit a nine-month high and U.S regional manufacturing contracted for the first time in a year, reviving double-dip recession fears.
Oil this year has traded in a $64.24-$87.15 range as the economy's recovery has not lifted demand sufficiently to lower ample stockpiles. U.S. combined petroleum stocks in the week to Aug. 13 climbed to their highest level since the government began keeping weekly records in 1990. [
]Speculative interest in oil slipped last week. Money managers cut net long crude oil positions on the New York Mercantile Exchange, the Commodity Futures Trading Commission said on Friday. [
]Oil prices had received some support early from the formation of Tropical Storm Danielle, which was expected to strengthen into a hurricane in the next 24 hours as it moved west-northwest toward Bermuda, the U.S. National Hurricane Center said. [
]But computer models expected the storm's trajectory to take it north, missing the Gulf of Mexico energy infrastructure. Though the Atlantic hurricane season was expected to be very active, so far the season has produced few disruptions to energy operations in the Gulf of Mexico region.
"The upcoming storm in the Atlantic is expected to deviate north and will again be a storm that will not have any impact on oil assets in the U.S. Gulf," said Olivier Jakob, analyst at Petromatrix, in a report. (Additional reporting by Alex Lawler in London and Alejandro Barbajosa in Singapore; Editing by David Gregorio)