* Tropical depression forming in mid-Atlantic -NHC
* Asian, European equities rise despite slower China growth
* Coming Up: U.S. manufacturing PMI; 1400 GMT
(Updates throughout)
By Joe Brock
LONDON, Aug. 2 (Reuters) - Oil rose towards a 12-week high above $79 on Monday, driven by a surge in risk appetite as robust corporate results spurred an equities market rally.
European stock markets followed Asian equities higher as investors focused their attention on the company earnings season after results from French bank BNP Paribas <BNPP.PA> beat expectations. [
]U.S. September crude <CLc1> rose 48 cents to $79.43 a barrel by 0806 GMT, having reached a 12-week high of $79.69 last week and climbed 4.35 percent last month. ICE Brent <LCOc1> gained 47 cents to $78.65.
Despite Monday's gains, crude futures were underperforming equity markets and analysts warned that the latest rally may be short-lived if investors focus on the weak fundamental outlook following lacklustre economic data.
"I don't see a reason for anymore significant rise in oil prices and today's gains could easily be wiped out," said Christophe Barret, oil analyst at Credit Agricole.
"Fundamentals have not improved when you look at Chinese and U.S. economic indicators they look pretty weak," Barret added.
China's official purchasing managers' index (PMI) fell to a 17-month low in July of 51.2 from 52.1 in June, the China Federation of Logistics and Purchasing (CFLP) said on Sunday.
The PMI is designed to provide a timely snapshot of business conditions and a figure above 50 indicates expansion. [
]On Monday, an index based on a nationwide survey of business executives conducted for HSBC showed Chinese manufacturing shrank in July for the first time since the global downturn in March 2009 on government steps to slow bank lending and fight property speculation. [
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SLOW GROWTH
Meanwhile, data on Friday showed that U.S. gross domestic product expanded at a 2.4 percent annual rate, missing expectations for growth of 2.5 percent, after an upwardly revised 3.7 percent growth pace in the first quarter.
Despite an uncertain outlook for energy demand many were still betting on further oil price gains.
Money managers increased net long crude oil positions, bets that prices would rise, to the highest level since May on the New York Mercantile Exchange in the week to July 27, the Commodity Futures Trading Commission said on Friday.
"Long positions are starting to creep back into the market," said Ben Westmore, a commodities analyst at National Australia Bank in Melbourne.
"It's a gradual process of regaining confidence that there is not going to be a default soon," he added, in a reference to the euro zone's debt crisis.
For a graphic on crude net long positions: http://graphics.thomsonreuters.com/10/CFTC_Crude300710.gif
A tropical cyclone forming in the mid-Atlantic also lent support to oil prices as the hurricane season enters what in recent years has been a period of peak activity between August and early October. Atlantic storms sometimes enter the Gulf of Mexico, posing a threat to U.S. and Mexican oil infrastructure.
The U.S. National Hurricane Center (NHC) said late on Sunday that a tropical depression may be forming in the mid-Atlantic, assigning a 90 percent likelihood that the system may become a tropical depression within the next day or so.
Attention this week will remain on U.S. economic data, with the Institute for Supply Management manufacturing index expected later on Monday, followed by July payrolls on Friday. (Additional reporting by Alejandro Barbajosa in Singapore; editing by sue Thomas)