* WHAT...Seas 11 to 14 feet expected.
* WHERE...Tinian and Saipan Coastal Waters.
* WHEN...From 1 AM Friday to 4 PM ChST Saturday.
* IMPACTS...Conditions will be hazardous to small craft.
* ADDITIONAL DETAILS...As Typhoon In-fa continues to approach the northern CNMI, seas are expected to quickly build up to around 14 feet over Tinian and Saipan waters. The large, long-period swell will slowly shift from northeast to northwest through Saturday.