* Oil rallies as high as $89.76, fades at $90 resistance
* Cold weather in U.S., Europe offers price support
* Banks raise 2011 oil price forecasts
(Updates prices, adds comment in paragraph 12)
By Alex Lawler
LONDON, Dec 6 (Reuters) - Oil eased from a 26-month high near $90 on Monday as the dollar strengthened, countering support from higher demand caused by cold weather in Europe and parts of the United States.
The euro fell, and the dollar rose against a basket of currencies, as the euro zone's debt problems weighed on sentiment. Oil and dollar-denominated commodities often move inversely to the dollar.
U.S. crude <CLc1>, also known as WTI, was down 8 cents at $89.11 by 1452 GMT. It traded as high as $89.76 earlier in the session, the highest intraday since Oct. 9, 2008. Brent crude <LCOc1> was up 11 cents to $91.53.
"We've had a bit of a pullback -- $90 is being a sticking point for WTI at the moment and we had a little dip because of the euro," said Rob Montefusco, a trader at Sucden Financial.
"Going forward, we might get a bit of a lift and push up again."
Analysts said the cold spell in Europe and in parts of the United States should limit the downside for prices, because of greater heating demand.
"The cold weather on both sides of the Atlantic will likely prevent any meaningful declines from setting in this week," said Edward Meir, analyst at MF Global, in a report.
DTN Meteorlogix, a private forecaster, expects temperatures in the U.S. Northeast to average near to below normal over the next six to 10 days and below normal in northwest Europe.
U.S. heating demand this week is expected to be more than 16.3 percent above normal, the National Weather Service forecast. [
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BACKWARDATION
Oil is moving into backwardation, where prompt prices are higher than those for delivery later.
The price structure, associated with tight supplies, could draw in buyers, analysts said. For the forward curve of U.S. crude click here: <0#CL:>
"This backwardation, which was rarely evident in the past few years, is likely to bring more buyers into the arena," analysts at Commerzbank said in a report.
Other analysts are calling for oil's rally to go further due to signs of a tightening market and falling inventories.
At least five banks raised their mid- or long-term price forecasts last week, citing factors such as rising demand in emerging markets, faster global economic growth and OPEC's reluctance to boost output. [
]For example, J.P. Morgan said on Friday oil would top $100 in the first half of 2011 and $120 before the end of 2012, predicting OPEC would be very slow to react to higher prices.
The Organization of the Petroleum Exporting Countries meets on Dec. 11. Rather than raise output to curb prices, OPEC is likely to roll over existing policy, ministers have said. (Additional reporting by Jennifer Tan in Singapore; editing by Alison Birrane)