Typhoon Watch

* WHAT...Tropical storm conditions, including winds of 34 to 63 knots, are expected. Typhoon conditions, including winds of 64 knots or more are possible within the next 48 hours.

* WHERE...Tinian and Saipan Coastal Waters.

* WHEN...Onset of damaging winds beginning Saturday night, continuing into at least Sunday night, possibly longer if conditions warrant.

* IMPACTS...Destructive winds will produce dangerous seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain.

* ADDITIONAL DETAILS...Tropical Storm Champi (29W) continues to move quickly toward the Marianas. The exact path of 29W remains subject to change. However, guidance supports a passage through Guam coastal waters, with damaging winds moving into Tinian and Saipan Saturday night and lasting into at least Sunday night. Champi is expected to strengthen further today and Saturday as it approaches, then move through the region as a typhoon Sunday morning. Seas will quickly rise, with significant sea heights reaching as high as 25 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday.