* WHAT...Very steep and hazardous seas 9 to 12 feet and north winds 15 to 25 kt with gusts up to 30 kt expected.
* WHERE...Waters from Cape Mendocino to Pt. Arena CA from 10 to 60 nm.
* WHEN...Until 9 AM PDT Tuesday.
* IMPACTS...Very steep and hazardous seas could capsize or cause damage to vessels.