* WHAT...Dangerously large breaking waves 22 to 30 feet.
* WHERE...Southwestern Humboldt and Coastal Mendocino Counties.
* WHEN...Until 4 AM PST Sunday.
* IMPACTS...Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life-threatening surf conditions and significant beach erosion can be expected.
* ADDITIONAL DETAILS...After only brief improvement late Saturday through Sunday, a second large swell is forecast late Sunday through Monday.