* First storm of Atlantic hurricane season developing
* U.S. Q1 economic growth revised down
* Coming Up: Group of 20 meeting at the weekend
(Updates prices, weather)
By Ikuko Kurahone
LONDON, June 25 (Reuters) - Oil rose on Friday due to concerns that a storm in the Caribbean may move towards the Gulf of Mexico, where oil facilities are clustered and BP continues to fight an oil spill.
But restraining price gains were data showing slower-than-expected economic growth in the United States in the first quarter and worries about the fragility of global recovery ahead of a weekend summit of Group of 20 nations.
By 1309 GMT, U.S. crude futures <CLc1> were up 99 cents to $77.50 a barrel, bouncing from the day's low of $75.90. Brent crude futures <LCOc1> were up by 78 cents to $77.25.
"The greatest risk will be with the potential development of a tropical storm that could make its way to the Gulf of Mexico. The NHC (National Hurricane Center) has now a high probability for the tropical low to be upgraded to Tropical Storm status over the next 48 hours," said Olivier Jakob with Petrometrix.
To kick off the Atlantic hurricane season this year, a low-pressure area over the western Caribbean Sea strengthened further and now has a high 70 percent chance of developing into a tropical depression over the next 48 hours, the NHC said on Friday.
Most weather models project the system will cross Mexico's Yucatan Peninsula over the next few days before entering the central Gulf of Mexico, where BP Plc <BP.L> is trying to clean up its oil spill.
Shares in the British oil major hit a 14-year low on Friday morning. [
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For graphics U.S. Gulf of Mexico offshore crude output: http://graphics.thomsonreuters.com/10/US_OFSHRD0610.gif
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Crude oil and product inventories remain much higher than year-ago levels In the United States, the world's top oil market. [
]High inventory levels can provide a cushion to reduce price spikes should bad weather cause supply disruptions. This was the case when hurricanes Katrina and Rita hit the U.S. Gulf of Mexico in 2005.
Ahead of the G20 summit, MSCI's all-country world stock index <.MIWD00000PUS> fell and European shares turned negative, having opened slightly higher. [
][ ]The U.S. Commerce Department revised first-quarter U.S. gross domestic product lower in its final estimate. The world's largest ecnomy expanded at a 2.7 percent annual rate instead of the 3 percent pace reported last month. [
]Oil prices have fallen from about $87 in early May amid euro zone concerns triggered by Greece's sovereign debt crisis and ample supplies.
U.S crude oil is expected to average $79.86 a barrel in 2010, a Reuters poll showed, a slight drop from May's survey and the second consecutive lower monthly forecast after more than a year of rising expectations. [
] (Additional reporting by Alejandro Barbajosa in Singapore; editing by Keiron Henderson and James Jukwey)