* WHAT...Very steep and hazardous seas 14 to 18 feet.
* WHERE...Marianas Coastal Waters.
* WHEN...Until 5 AM ChST Thursday.
* IMPACTS...Very steep and hazardous seas could capsize or cause damage to vessels.
* ADDITIONAL DETAILS...As Typhoon Bavi continues to move west- northwest and away from the Marianas, conditions will gradually improve in the coming days. For small craft operations, dangerous marine conditions still persist through at least Wednesday night.