* WHAT...Very steep and hazardous seas 16 to 21 ft at 16 seconds and south winds 10 to 20 kt with gusts up to 25 kt.
* WHERE...In the Main Channel of the Columbia River Bar.
* WHEN...Until 7 PM PST Monday.
* IMPACTS...Very steep and hazardous seas could capsize or cause damage to vessels.
* ADDITIONAL DETAILS... First Ebb current of 4.04 kt at 806 PM Sunday. Seas 19 to 21 ft. Second Ebb current of 2.12 kt at 927 AM Monday. Seas 16 to 18 ft. Third Ebb current of 3.62 kt at 904 PM Monday. Seas 12 to 14 ft.