Small amounts of oil and tar washed ashore as far south as San Diego County on Thursday as cleanup and recovery efforts accelerated following the oil spill along the Orange County coast.

Officials said they’ve made progress in the cleanup and hope to advance even further over the weekend. But a storm that meteorologists say could bring 20-mph winds to the region is moving in, raising concerns that more oil could reach the shores. So far, much of the crude has remained offshore, but striations have been seen in Huntington Beach and Laguna Beach.