But other experts say that the oil is already there—satellite images show oil caught up in one of the eddies, or powerful whorls, attached to the Loop Current, a high-speed stream that pulses north into the Gulf of Mexico and travels in a clockwise pattern toward Florida.

Images from the past few days show a "big, wide tongue" of oil reaching south from the main area of the spill, off the coast of Louisiana, said Nan Walker, director of Louisiana State University's Earth Scan Laboratory, in the School of the Coast and Environment.

Meanwhile, a particular eddy has intensified and expanded north in recent days. The images reveal that the eddy has