Entire West Coast warned of dangerous ocean conditions.

The National Weather Service issued high-surf and small-craft advisories across the U.S. West Coast as Pacific storms generated waves reported up to about 26 feet, and impacts were expected through Thursday.

Dangerous ocean conditions affected the entire U.S. West Coast as strong Pacific waves moved onshore. The National Weather Service issued high-surf and small-craft advisories covering Washington, Oregon and California. NWS meteorologists said the waves originated from a low-pressure system over the northern Pacific near Alaska. Some breaking waves were reported as high as 26 feet and impacts were expected through Thursday. Key facts: - The National Weather Service issued high-surf and small-craft advisories that span the West Coast. - NWS Portland said the waves came from a strong low-pressure system in the northern Pacific near Alaska. - Forecasts indicated some breaking waves up to about 26 feet, with localized beach erosion and higher-than-normal water run-up possible. - Advisories were expected to begin as early as mid-morning Thursday in the Pacific Northwest and affect parts of California by Wednesday afternoon; impacts were expected through Thursday morning or afternoon depending on location. Summary: The advisories describe hazardous sea conditions across a broad coastal stretch, including large breaking waves and the potential for localized erosion. The National Weather Service said it will continue to monitor conditions and provide updates as new data become available.