* EIA report shows surprise rise in crude oil inventories
* Carib weather system on track for Gulf; Shell evacuates
* Coming Up: Fed's Bernanke at Senate at 2 p.m. (Recasts, updates prices, market activity, changes byline and moves dateline from previous LONDON)
By Robert Gibbons
NEW YORK, July 21 (Reuters) - Oil prices slipped on Wednesday, falling from a 3 1/2-week high after data showed U.S. crude inventories unexpectedly rose last week, but a tropical weather system approaching the Gulf limited losses.
Commercial U.S. crude inventories rose 360,000 barrels in the week to July 16 to 353.46 million barrels, against a forecast stocks would be down 1.4 million barrels, the U.S. Energy Information Administration reported. [
]U.S. crude oil for September delivery fell 80 cents to $76.78 a barrel by 1:47 p.m. EDT (1747 GMT), trading from $76.59 to $78.57.
Heating oil prices fell below $2 a gallon immediately after the data showed heating oil and total distillate stockpiles rose. Gasoline prices also pulled back after the inventory report showed rising stockpiles.
"This report was negative across the board, with the unexpected build in crude stocks and the build in products too as refineries ramped up production," said Mike Zarembski, senior commodities analyst at Optionsxpress in Chicago.
Before the EIA data, optimism about the economy reflected in rising equities markets had lifted oil prices to $78.57, building on the previous two days of gains.
The reversal after the inventory data pulled oil prices back below two key technical resistance points: the 200-day moving average at $77.58, and a trend line connecting several intraday peaks going back to April 6.
London ICE Brent futures <LCOc1> fell 26 cents to $75.96.
Rising crude oil imports, up 696,000 barrels per day to 9.94 million bpd, helped offset a 1 percentage point rise in refinery capacity utilization.
The increased refinery use pushed gasoline inventories up 1.12 million barrels, more than the forecast build of 900,000 barrels. Distillate stocks jumped up 3.94 million barrels, much more than the forecast rise of 1.7 million barrels. <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Graphic:http://link.reuters.com/hun72k
To see the latest storm tracks see: http://www.skeetobiteweather.com/
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STORM WORRIES
After the inventory report crude prices rose more than 30 cents off the intraday low of $76.59 on news Shell Oil Co <RDSa.L> has begun pulling nonessential staff from Gulf of Mexico operations because of the threat of a possible tropical storm. [
]Although the U.S. National Hurricane Center lowered to 60 from 70 percent the chance a tropical wave moving across Hispaniola on Wednesday would form a tropical depression, the storm remained on a projected course that would take it toward the main Gulf of Mexico oil platforms. [
]"Crude futures fell on the EIA data showing builds in crude and product inventories, but are now paring losses on fears of the possibility of a storm hitting the Gulf of Mexico," said Andy Lebow, broker at MF Global in New York.
Most weather models projected the system would cross South Florida and the eastern Gulf of Mexico before hitting the Central Gulf Coast.
Results from U.S. investment bank Morgan Stanley <MS.N> and diversified U.S. manufacturer United Technologies Corp. <UTX.N> both helped support sentiment, traders said, but U.S. stocks seesawed near parity as traders waited for Federal Reserve Chairman Ben Bernanke to appear before a Senate committee at 2 p.m. EDT (1800 GMT). [
] (Additional reporting by Gene Ramos and Edward McAllister in New York, David Turner and Joe Brock in London and Alejandro Barbajosa in Singapore; Editing by Sofina Mirza-Reid)