Severe · Typhoon WatchActive alert
Typhoon Watch issued October 17 at 10:39PM ChST by NWS Tiyan GU
Affecting Tinian Coastal Waters; Saipan Coastal Waters
In effect until: Oct 18, 2026, 2:45 AM
Tinian Coastal Waters; Saipan Coastal Waters
Possible impact zone; conditions develop through 2:45 AM.
Prepare for tropical storm force conditions through Sunday night. Secure all vessels. Conditions are expected to be extremely dangerous for small craft, and dangerous for any vessels of larger size. As Typhoon Champi approaches the Marianas, stay in safe harbor.
Read the original bulletin (official text)
* WHAT...Tropical storm conditions, including winds of 34 to 63 knots, are expected. Typhoon conditions, including winds of 64 knots or more are possible. * WHERE...Tinian and Saipan Coastal Waters. * WHEN...Onset of damaging winds beginning late tonight, 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...Typhoon 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, a bit south of Guam, with damaging winds moving into Tinian and Saipan Waters tonight and lasting into at least Sunday evening. Champi is expected to strengthen further as it approaches, then move through the region as a category 4 super typhoon Sunday morning. Seas are quickly rising, with significant sea heights reaching as high as 25 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™