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Jae C. Hong, Associated Press
Plastic buckets filled with oil collected from the beach at Refugio State Beach, north of Goleta, Calif., Thursday, May 21, 2015. More than 7,700 gallons of oil has been raked, skimmed and vacuumed from a spill that stretched across 9 miles of California coast, just a fraction of the sticky, stinking goo that escaped from a broken pipeline, officials said.

GOLETA, Calif. — Weather has slowed cleanup efforts at the site of an oil spill that fouled a California shoreline.

The National Weather Service says gusty winds are whipping up waves as high as 4 feet early Friday off Santa Barbara County. Several days of calm seas had helped crews.

A small watercraft advisory was issued overnight and Santa Barbara news station KEYT-TV says oil skimming vessels were brought in late Thursday because of bad weather.

Crews have yet to excavate the section of pipeline that broke Tuesday, spilling an estimated 105,000 gallons of crude. About 21,000 gallons is believed to have made it to the sea and split into slicks that stretched 9 miles along the coast.

As of Thursday, more than 9,000 gallons had been raked, skimmed and vacuumed up.